Fix BIOS Power-On Self-Test (POST) errors on Windows computers

If when you kicking your Windows eleven/10 device and the computer fails to boot successfully and throws whatever of the BIOS Power-On Self-Test (POST) error codes, then this post is intended to help you with the solution you tin can try to resolve the outcome.

Fix BIOS Power-On Self-Test (POST) error codes

Fix BIOS Ability-On Self-Test (Postal service) errors

When you lot run into a BIOS Postal service mistake code (head over to Oracle.com for a list of Mail codes and their descriptions), information technology'due south usually accompanied past a single or more calculator beep audio.

If y'all encounter any POST code mistake, you lot can endeavour our recommended solutions below in no item order and see if that helps to resolve the issue.

Remove new hardware
Unplug any disks or USB devices
Disconnect external devices
Reconnect and cheque power cords
Identify beep code
Check fans
Check cables
Disconnect all expansion cards
Disconnect all drives
Remove RAM
Power bike the computer
Disconnect and reconnect the CPU
Cheque if BIOS chip is loose
Articulate CMOS
Update BIOS
Supercede motherboard, CPU, RAM, PSU

Let'due south have a look at the description of the procedure involved concerning each of the listed solutions.

Note: To carry out most of thes instructions, you may require the services of a hardware technician.

one] Remove new hardware

If y'all recently added new hardware to the computer, remove that hardware to brand sure it is non the culprit. If your figurer works fine after removing the new hardware, and then it's either the new hardware is not uniform with your computer, a arrangement setting needs to be inverse, or the new hardware is defective.

2] Unplug whatsoever disks or USB devices

Remove all disks, CD/DVD that are in the figurer. If any USB devices (iPods, drives, phones, etc.) are continued, disconnect all of them as well. Reboot the computer and see if annihilation changes.

3] Disconnect external devices

Disconnect all devices from the back of the desktop calculator, except the power cable. Plough on the reckoner and run across if it beeps normally. If the computer has never beeped, keep the monitor or display connected to see if any modify occurs.

4] Reconnect and check ability cords

If the computer is not getting enough power or the power is getting interrupted, you may see any of the BIOS POST error codes. Disconnect your ability cables from any power strip or UPS (uninterruptible ability supply) and connect the estimator direct to a known good wall outlet and see if that helps.

5] Identify beep code

If you are receiving a sequence of beeps, see a listing of different beep codes and their caption. You can also check your motherboard or estimator documentation for data on the beep codes. These beep codes are meant to assist place which calculator component is failing or bad. If your beep code is not listed, keep troubleshooting.

6] Check fans

Make certain 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 and consequently trigger a Post code fault.

7] Check cables

Verify all the cables are deeply connected to the computer and that in that location are no loose cables past firmly pressing in each cable. Ensure all disk drives should have a information cablevision and power cable connected to them. Too, your power supply should have at to the lowest degree one cable going to the motherboard. Many MOBOs may besides accept additional cables connected to them to supply power to the fans.

8] Disconnect all expansion cards

If the above recommendations still take 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 Mail, connect one menu at a time until you lot decide which menu is causing the trouble.

9] Disconnect all drives

If you cannot diagnose the problem by the beep lawmaking (or y'all do non hear a beep code), power off the computer. And then, disconnect any IDE, SATA, SCSI, or other data cables from the MOBO. Afterwards disconnecting them, endeavour booting the computer again.

If this resolves your irregular POST or generates error letters, reconnect each device until you determine which device or cablevision is causing the issue.

10] Remove RAM

If you continue to feel the aforementioned 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 lawmaking or was not beeping but is at present, plow off your computer and try the suggestions below. Make sure to turn off the computer earlier calculation and removing the memory and and so turning information technology back on to see if the proposition resolves the issue.

Re-insert the memory into the aforementioned slot.
If you have more than one stick of retentivity, remove all but one stick of memory and effort rotating through each stick.
Endeavour ane stick of retentiveness in each slot.

If you can get the computer to kicking with one or more of the sticks of memory installed, y'all are likely dealing with some bad memory. Try to identify which stick of retention is bad and replace information technology.

If you can become the memory to piece of work in one slot simply not another slot, the motherboard is likely defective. You can either workaround the result by running the memory in a dissimilar slot that does work or supplant the motherboard.

11] Power cycle the calculator

In some situations, a computer may have ability related issues oftentimes caused past either the ability supply or the motherboard. To help determine if this is the issue, try turning the computer on, off, and back on equally fast as possible, making sure the figurer power calorie-free goes on and off. In some situations, you may get the computer to boot.

12] Disconnect and reconnect the CPU

You tin reseat the CPU past removing information technology and re-inserting it into the socket. You should also use a fresh layer of thermal compound betwixt the CPU and the estrus sink.

xiii] Check if BIOS flake is loose

If your motherboard has a BIOS flake, it tin become loose over time due to heat expansion and cause the estimator to give an irregular Mail. Gently printing down on the BIOS scrap to brand sure it has not become loose.

14] Clear CMOS

To articulate the CMOS, do the following:

Turn off all peripheral devices connected to the computer.
Disconnect the power cord from the Air-conditioning power source.
Remove the computer encompass.
Find the bombardment on the lath. The battery may be in a horizontal or vertical bombardment holder, or connected to an onboard header with a wire.

If the battery is in a holder, note the orientation of the + and – on the battery. With a medium apartment-blade screwdriver, gently pry the battery free from its connector.

If the battery is connected to an onboard header with a wire, disconnect the wire from the onboard header.

Wait one hour, and then reconnect the battery.
Put the computer cover back on.
Plug the reckoner and all devices back in.

Boot the calculator and run into if POST mistake occurs.

15] Reset BIOS to default settings

You can reset the BIOS setting to its default valuesand meet if issue is resolved.

16] Update BIOS

Updating the BIOS and firmware on your system could assistance prepare the outcome. Since you lot're unable to boot to the desktop, y'all tin can update BIOS by creating a bootable USB on a working machine and and then boot the faulty PC with the bootable media.

Once you complete the manual update of the BIOS/firmware on your system, come across if the issue is resolved.

17] Supervene upon motherboard, CPU, RAM, PSU

At this indicate, if zilch has worked so far, it's likely you take a instance of bad motherboard, power supply, CPU, or RAM stick. In which instance, y'all demand to either replace these components or have the figurer serviced. Y'all tin can supersede or swap in parts from another computer that is known to piece of work. Practise the replacing in this sequence; the motherboard outset, then the RAM, the CPU, and finally, the PSU.

Hope you find the troubleshooting outlined in this post helpful!

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