Pc wont post

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POST troubleshooting steps

Updated: 11/30/2020 by Computer Hope

POST error

The POST (power on self-test) is a set of procedures that a computer runs through each time it is turned on. It ensures that all of the system's hardware is working properly before trying to load the operating system. If the computer does not pass POST, it will not boot.

If you're experiencing POST errors when you boot your computer, the following steps may help you fix the problem.


Some of the steps below recommend removing physical parts from inside the computer. While working inside the computer, it's highly recommended you be aware of ESD (electrostatic discharge) and its potential hazards.

Remove new hardware

If any new hardware was recently added to the computer, remove that hardware to make sure it is not causing your issue. If your computer works after removing the new hardware, it can mean a few things. Either the new hardware is not compatible with your computer, a system setting needs to be changed, or the new hardware is defective.

Remove any disks or USB devices


Remove any disks, CDs, or DVDs that are in the computer. If any USB devices (iPods, drives, phones, etc.) are connected, disconnect all of them as well. Reboot the computer and see if anything changes.

Disconnect external devices

Remove everything from the back of the computer, except the power cable. Turn on the computer and see if it beeps normally. If the computer has never beeped, keep the monitor or display connected to see if any change occurs.

Reconnect and check power cords

If the computer is not getting enough power or the power is getting interrupted, the computer can encounter problems. Disconnect your power cables from any power strip or UPS (uninterruptible power supply) and connect the computer directly to a known good wall outlet.

Identify beep code

If you are receiving a sequence of beeps, see the beep code page for a listing of different beep codes and their explanation. You can also check your motherboard or computer documentation for information on the beep codes. These beep codes are meant to help identify which computer component is failing or bad. If your beep code is not listed, continue troubleshooting.

Check all fans

Make sure all fans are running on the computer. If a fan has failed (especially the heat sink fan for the CPU), your computer could be overheating or detecting the fan failure, causing the computer not to boot.

Check all cables

Verify all the cables are securely connected to the computer and that there are no loose cables by firmly pressing in each cable.

  • All disk drives should have a data cable and power cable connected to them.
  • Your power supply should have at least one cable going to the motherboard. Many motherboards may also have additional cables connected to them to supply power to the fans.

Disconnect all expansion cards

If the above recommendations still have not resolved the irregular POST, disconnect the riser board (if applicable) and each of the expansion cards. If this fixes the problem or allows the computer to POST, connect one card at a time until you determine which card is causing the problem.

Disconnect all drives

If you cannot diagnose the problem by the beep code (or you do not hear a beep code), power off the computer. Then, disconnect any IDE, SATA, SCSI, or other data cables from the motherboard. When they are disconnected, try booting the computer again.

If this resolves your irregular POST or generates error messages, reconnect each device until you determine which device or cable is causing the issue. In some situations, it can also be a loose cable connection that causes the issue.

Remove the RAM

If you continue to experience the same problem with all the above hardware removed, remove the RAM from the motherboard and turn on the computer. If the computer has a different beep code or was not beeping but is now, turn off your computer and try the suggestions below. Make sure to turn off the computer before adding and removing the memory and then turning it back on to see if the suggestion resolves the issue.

  1. Re-insert the memory into the same slot.
  2. If you have more than one stick of memory, remove all but one stick of memory and try rotating through each stick.
  3. Try one stick of memory in each slot.

If you can get the computer to boot with one or more of the sticks of memory installed, you are likely dealing with some bad memory. Try to identify which stick of memory is bad and replace it.

If you can get the memory to work in one slot but not another slot, the motherboard is likely defective. You can either workaround the issue by running the memory in a different slot that does work or replace the motherboard.

Power cycle the computer

In some situations, a computer may have power related issues often caused by either the power supply or the motherboard. To help determine if this is the issue, try turning the computer on, off, and back on as fast as possible, making sure the computer power light goes on and off. In some situations, you may get the computer to boot.


Try this method only as a temporary workaround or as a last resort to get any valuable information from the computer.

Disconnect and reconnect the CPU

For users who're more comfortable working inside their computer, reseat the CPU by removing it and re-inserting it into the socket. You should also apply a fresh layer of thermal compound between the CPU and the heat sink.

Loose BIOS chip

If your motherboard has a BIOS chip, it can become loose over time due to heat expansion and cause the computer to give an irregular POST. Gently press down on the BIOS chip to make sure it has not become loose.

Bad motherboard, CPU, RAM, or power supply

If, after trying all of the above recommendations you still have an issue, you likely have a bad motherboard, power supply, CPU, or RAM stick. The next step would be either to replace these components or have the computer serviced. If you plan on doing the repairs yourself, we suggest you replace or swap in parts from another computer that is known to work. Replace the motherboard first, then the RAM, the CPU, and finally, the power supply.

Sours: https://www.computerhope.com/issues/ch000607.htm

Computer Won’t Post? Follow These Methods to Easily Fix It! [MiniTool News]

Summary :

computer won't post

Sometimes when you turn on your computer, you may find it won’t post before going to BIOS. As a result, the computer fails to start up. If you are experiencing this case, refer to this post and MiniTool will offer some methods to get rid of computer not posting.

Computer Won’t Post

You should know that the computer will start power-on self-test (POST) when the power is turned on. This can ensure the computer’s hardware works properly before loading the operating system. If the hardware passes POST, the startup process will continue and a single beep sound appears. If the computer doesn’t post, the PC cannot go to the BIOS menu and it is not bootable.

To learn more information on power-on self-test, refer to MiniTool’s library - Full Introduction to POST and It’s Different Types of Errors.

Why is the computer not posting? A POST failure can be triggered by some reasons, for example, new hardware conflicting with old hardware, failing or bad hardware device, electrical shorts or incompatibilities.

If you are encountering this issue, what should you do to get rid of PC not posting? Try these methods to easily fix this problem. Let’s see them now.

Fix It If Computer Won’t Post

Remove New Hardware

If you have recently added new hardware to your PC, just remove it to ensure it is not the reason for PC not posting. After removing the hardware, if the PC works well, it is possible that the new hardware is not compatible with your PC, or you need to change a system setting to work with the new hardware device or the new hardware is defective.

Remove USB Devices &Disc

If you connected CDs, DVDs or USB devices including iPods, phones, drives, etc. to your computer, disconnect all of them and reboot the computer to see if it can pass POST.

Disconnect External Devices

Except for the power cable, remove everything from the computer’s back. Then, power on the PC to see if its beep sound is normal. If there is not a beep sound, connect the monitor or display and see if any change happens.

Identify Beep Codes

If you get a series of beeps, check the motherboard or computer documentation for the information on beep codes or go to this post from computerhope - Computer POST and beep codes to know much. Then, you can identify which component of the computer goes bad or failing.

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If you cannot diagnose the problem via the beep code or there is no beep sound, turn off your computer. Then, disable the IDE, SCSI, SATA or other cables from the motherboard and reboot the computer. If this works to fix the POST failure, reconnect each device at a time to ensure which device is causing the issue

Check the Power Cables

Make sure the power cables are connected properly and securely.

Besides, if the computer doesn’t have enough power or the power is interrupted, there may be some problems, for example, the computer won’t post. Just disconnect power cables from any power strip and connect the computer to a wall outlet.

Check All Fans

You can check your computer’s fans and see if they are running properly. If a fan, especially the CPU’s heat sink fan fails, the computer may be overheating or detect the fan failure, leading to a POST failure.

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Disconnect All Expansion Cards

Sometimes disconnecting the riser board and all the Expansion Cards is helpful if PC won’t post. These cards are not essential to system operation. If you find this way can fix the issue, connect one card at a time until you know which card causes the problem.

Disconnect and Connect RAM and CPU

If the computer still won’t post, try to disconnect the CPU and RAM from the motherboard. Then, connect them back to see if your issue is solved.

Other ways:

  1. Ensure RAM is compatible with the motherboard.
  2. RAM, PSU or motherboard may be damaged and you need to test each component separately. If one of them is bad, replace it.

Related articles:

Final Words

Computer won’t post? After reading this post, you know what you should do to troubleshoot PC not posting. Just follow these instructions and know what causes the issue and fix it.



VeraFollow us

Position: Columnist

Vera is an editor of the MiniTool Team since 2016 who has more than 5 years’ writing experiences in the field of technical articles. Her articles mainly focus on disk & partition management, PC data recovery, video conversion, as well as PC backup & restore, helping users to solve some errors and issues when using their computers. In her spare times, she likes shopping, playing games and reading some articles.

User Comments :

Sours: https://www.minitool.com/news/computer-wont-post.html
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Here is a troubleshooting guide to solve why your computer isn’t posting. Try these steps to hopefully get your computer up and running, or at the very least, find out which component is most likely the cause.

It can happen to computers old and new, you go to turn on a computer and nothing happens. It’s most certainly not the best feeling in the world. The good news is that computers can be easily repaired.

Here are some of the symptoms that may be happening to indicate a no post situation:

  • Beeping: You could have a single beep or a series of beeps. Some could be short, and others long. We will go into the various beeps and their meanings later in this article.
  • Power light: It could be that you hear nothing and only see a power light.
  • Cooling fans: Your computer could have the fans spinning and nothing else much happening.

Important: For this troubleshooting guide to be effective, we are going to assume that you have checked your power supply. This can be by testing it on another computer or replacing it with a new one.

The power supply is a crucial component and we cannot ensure proper testing of any other computer component if the power supply hasn’t been checked first.

Side Note: I am not responsible for any damage you may cause. The methods in this article are sound, but I cannot take responsibility for anything that may be done outside the scope of this article.

Troubleshooting a computer that’s not posting

Go through these steps in order to help you track down the problem. By removing all of the components out of the scene first, will not only help speed up the diagnosing process but also reduce the number of components that could cause problems.

If you are hearing beeping when trying to start up your computer, you can get an idea of which component could be at fault by observing the beep sequence.

1. Set up your workspace and prepare your computer

  • Find the motherboard manual: If you can download the motherboard manual. If you have kept it, well done!
  • Get a screwdriver: Find a Phillips screwdriver that fits nicely in the computer’s screws.
  • Move to a good work area: Set your computer up in a location that’s easy to work on. Lots of free room that is clutter-free around the computer is great.
  • Ground yourself: Before touching any components, touch the computer case to limit any potential electrostatic discharges.
  • Unplug everything: Before following any of the following steps, make sure you have unplugged the power to the computer. Also, disconnect all other plugs or cables connected to your computer.

2. Disconnect all drives

Computer Not Posting? Here's A Useful Troubleshooting Guide 1
Computer Not Posting? Here's A Useful Troubleshooting Guide 2
Computer Not Posting? Here's A Useful Troubleshooting Guide 3

Unplug all the power connectors to all drives. Then unplug all data cables connected to your motherboard. You can do this at the drive end of the cable to help make it easier to reconnect. It will also help you keep track of which cable was connected to which drive.

3. Remove all add-in cards

Computer Not Posting? Here's A Useful Troubleshooting Guide 4

Unscrew all the cards that are plugged into the motherboard. Remove them all by pulling them evenly straight up and level.

If your motherboard doesn’t have an onboard graphics output, get your hands on a different graphics card and replace your existing one. If you don’t have another one to try, leave it plugged in for now.

4. Disconnect all fans (Except the CPU fan)

Computer Not Posting? Here's A Useful Troubleshooting Guide 5

Unplug all the fan connections from power. Some will be connected to the motherboard using pin header connections, and others will be plugged straight into the power supply.

Once all of them have been unplugged, check that you still have your CPU fan connected. This will be the fan attached to a heatsink that is screwed or clipped directly on your motherboard.

5. Remove the BIOS battery

Computer Not Posting? Here's A Useful Troubleshooting Guide 6
Computer Not Posting? Here's A Useful Troubleshooting Guide 7

Gently remove the BIOS battery. This is a silver coin cell battery that keeps the information held in a memory chip. This keeps all the settings for various hardware functions to operate as set by the user.

If you are unable to see it, look in your motherboard manual to find where it is situated. Sometimes some cables or drives etc. can obstruct your view.

Sometimes, I have found batteries that have gone below circuit voltage and unleashes a variety of problems. I have also found some to have high internal resistance, causing more issues.

The computer doesn’t need it to be installed to run, it will run fine without it. All it does is retain settings you have saved in the BIOS when power has been disconnected from the computer altogether.

Important: Make sure that you have no power connected to the computer for about five minutes with the battery removed before continuing.

6. Reconnect a keyboard, monitor and mains power

Plugin your keyboard, the monitor’s display cable, and mains power cable to the computer. Make sure the power is turned on.

7. Press the power button

Press the power button and observe. If the computer starts normally, congratulations! All you have to do is add each component back to find out which one was the cause.

If you still can’t get it to start, continue with the guide.

If the computer still won’t post

Now we are getting down to the final few components that will be causing a problem if you have made it this far. Follow these instructions until you reach the stage that your computer posts again.

Disconnect all front panel connectors from your motherboard. You will have to use a screwdriver, tweezers, pliers or anything else that can short out the pins instead of the power button from your computer’s case.

The correct power button pins will be shown in the manual. If you couldn’t get your hands on your motherboard manual, take a photo of the front panel connectors before removing them. The most important pins to memorize are the power button pins.

The remaining suspects:

  • CPU: This is the brains of the computer. It’s the component that processes all the information for your computer to use.
  • RAM: This keeps all the data ready for your CPU to use, amongst other things.
  • Motherboard: This is the main board secured to the computer case that everything plugs into.
  • Graphics card: It sends all visual data from your computer to be displayed on the monitor.

Eliminate the graphics card

Computer Not Posting? Here's A Useful Troubleshooting Guide 8

If you already removed your graphics card, or you are using the display output from the motherboard for the monitor, skip this step.

If you are using the original graphics card from when the computer went faulty, it’s time to swap it out with a replacement to test if it was the cause of the no post situation.

If you are on a tight budget, purchase a cheap card to get you by in the meanwhile, nothing wrong with that. It can also be kept as a test card for the future if it turns out that it wasn’t the cause of your problems.

Eliminating the RAM (Random Access Memory)

Computer Not Posting? Here's A Useful Troubleshooting Guide 9

In all of my computer repair career, I have had a handful of times where I have found RAM to be truly faulty. Quite often a RAM module is blamed when it is simply a RAM contact problem.

Please follow my guide here, on how to clean the RAM contacts properly.

If cleaning the RAM still leaves you with no posting, try leaving one module in at a time and cycle through the modules.

If the situation remains unchanged, it’s most likely not the RAM at fault.

Eliminate the CPU and motherboard

Computer Not Posting? Here's A Useful Troubleshooting Guide 10
Computer Not Posting? Here's A Useful Troubleshooting Guide 11

I’m afraid that the only way to test a CPU is by actually replacing it and seeing if the computer posts. The motherboard can be just as difficult unless you are trained to repair them.

It will be easy enough to figure out which one of them is faulty by swapping one of them out if you had the spare parts. But for most average people, spare parts aren’t just hanging around.

If you are determined to fix your computer yourself, check the motherboard for signs of damage, burn marks on components or the board, or swollen capacitors.

Computer Not Posting? Here's A Useful Troubleshooting Guide 12

If you see anything unusual, replace your motherboard. I have seen more faulty motherboards compared to CPUs, provided that some CPU overclocking was never applied.

Alternative Option: You could take the CPU and motherboard over to your local computer store to ask them to test them for you. They would most likely have spares to test either your CPU or motherboard so you can eliminate the faulty component.


Always make sure that you use your senses to assess a component’s condition.

  • Sight: Look carefully for any physical damage. It’s easy to overlook, so take your time. Use some sort of magnification too if possible.
  • Smell: Be aware of any out of the ordinary smells. Components that don’t have visible damage, could have an odor telling you something is wrong.
  • Touch: Feel for components running too hot. This can be any semiconductor or a tiny passive component. See where it connects to.
  • Hear: Listen out for odd sounds. Sometimes this can be a dead giveaway for a component that is faulty.

Your senses can be a sophisticated diagnostic tool. With practice, you will be surprised how good you can get.

Always take your time and think. Sometimes you can figure out the likely suspects by memory and reason alone.

I wish you all the best luck in tracking down your computer’s problem and that you get it posting once again!

Sours: https://computerinfobits.com/computer-not-posting/
Our custom AMD 3900X system won’t POST... BIOS Failure?

read: Computer Won't POST? (How to troubleshoot)

You just built a computer, or the one you have suddenly won't boot up.... what you have now is a P.O.S.T. Failure. (Power On Self Test).
This document is intended to help users who are experiencing issues with POST and may have any of the below symptoms.

1.Computer beeps irregularly when the computer is turned on.
2.Computer turns on but does not boot.

Note: Not all computers have beep codes, some of the newer computers have LED's that light up that indicate the error or have a sound file to indicate the error.

A POST failure can be caused by any of the following situations.
1.New hardware conflicting with old hardware
2.Bad or failing hardware device.
3.Other hardware issue. (electrical shorts or incompatibilities.)

Warning: Some of the below steps recommend removing physical parts within the computer. While in the computer it is highly recommend that you be aware of electro-static discharge and its potential hazards. ALWAYS ground yourself and your equipment. Ensure your computer is unplugged!

Note: Make sure your computer is turning on, if you press the power button and nothing happens (no lights, no sound, no fans, etc.) then this issue is not a NO POST but is an power related issue.

If any new hardware has been recently added to the computer, remove that hardware to make sure it is not the cause of your issue. If after removing the new hardware your computer works it's likely the computer is either not compatible with the new hardware or a system setting needs to be changed to work with the new hardware device.

1.Remove everything from the back of the computer except the power cable. Turn on the computer and see if it beeps normally. If the computer has never beeped also connect a monitor to the computer to see if any change occurs.

2.Check the stand-offs (the metal or plastic insulators) that keep your motherboard off and away from the case or housing. Ensure they are not grounding or shorting the motherboard out. If they are metal, ensure that the cardboard insulators are present. Ensure the motherboard is not grounding out to the case also at any other point.

3.If you are receiving a sequence of beeps consult your motherboard manual or the motherboard manufacturer's website for a listing of different beep codes and their explanation. These beep codes are meant as a method of quickly identifying what computer component is failing or bad.

4.Check to make sure power cables are not grounding or shorting to the case or other components. Ensure all ends are connected properly, securely, and snugly.

5.Make sure all fans are running in the computer. If a fan has failed (especially the heat sink fan for the CPU) your computer could be overheating and/or detecting the fan failure causing the computer not to boot.

6.If you were unable to determine by the beep code what is failing or do not have a beep code disconnect the IDE cables from the CD-ROM, Hard Drive, and Floppy drive from the Motherboard. If this resolves your post failure, attempt to connect each device one at a time to determine which device and or cable is causing the issue.

7.If the above recommendations still have not resolved the irregular POST, start disconnecting your expansion riser cards, these are the cards that are not essential to system operation. Break your motherboard down to the bare basics. Disconnect your floppy drive, CD/DVD Rom, and hard drives Your motherboard basics should have just the following: video card, RAM, motherboard and PSU (power supply unit). If this resolves the issue or allows the computer to post connect one card or device at a time until you determine which card or device is causing the issue.

8.If you continue to to receive the same problem with all the above hardware removed attempt to disconnect the CPU and RAM from the Motherboard. Once done insert the CPU and RAM back into the computer to see doing this resolves your issue.

9.Ensure your PSU is of the correct size and power requirements for your system. Many newer motherboards and graphics cards are power intensive. Some newer graphics cards require their own separate power supplies. An underpowered PSU, will also cause system failure. Most new systems will not run well with less than 450W PSUs.

10.If after doing all of the above recommendations you continue to have the same issues unfortunately it is likely that you have bad or incompatible components, in particular RAM. Ensure your RAM is compatible with the motherboard. Many newer motherboards are very specific about what RAM sticks they will accept. Don't mix and match RAM speeds, type, or size.

11.If you have determined your components are compatible, then you have faulty hardware. The next step would be to test each component separately. You will need to find a working motherboard to test RAM with a diagnostic program like Memtest 86+. A faulty motherboard will need to be simply replaced. A bad PSU can only be replaced. Don't attempt to repair a bad or failing PSU. This is quite dangerous. High voltages and hazardous chemicals are present in PSU capacitors and other components – even when main power is disconnected. You can only replace a bad PSU.


Sours: https://www.techspot.com/community/topics/read-computer-wont-post-how-to-troubleshoot.50594/

Wont post pc

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How To Fix a PC That Doesn't Boot - Troubleshooting Tips

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