Hp desktop 8100 blinks red 4 times when I turn it on what do I do?

desperateforhelp - Jun 24, 2021 at 07:34 PM
 Peter - Jul 8, 2022 at 01:28 AM
Hello, Kris

System Configuration: iPhone / Safari 604.1

2 replies

Registration date
Tuesday June 30, 2020
Last seen
June 30, 2021
Jun 30, 2021 at 03:02 AM
The Diagnostic LED blinks red 4 times (once per second): This indicates power failure.

To resolve the issue, complete the following steps:

Perform the power supply self-test.
Open the access panel, and ensure that the necessary power supply cables are connected to the system board.
Locate a faulty device by removing all devices, and then reinstalling one at a time until the workstation fails:
Disconnect AC power to the workstation.
Remove all the devices.
Reinstall a device.
Reconnect AC power.
Replace the device causing the failure. Continue adding devices to ensure that all devices are functioning properly.
Verify the power supply functionality.
Disconnect AC power.
Remove all internal power supply cables from the system board.
Plug in AC power.
If the power supply fan spins, and the LED illuminates, then the power supply is good. Replace the system board.
If the power supply fan does not spin, or the LED does not illuminate, then replace the power supply.

If none of above methods not working, check out post below.

The possible reason is an overloaded power supply.    Disconnect all external devices to see if any of those items are causing the problem.  Power on the system. If the system enters the POST, then power off and replace one device at a time and repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly.

Hope This Helps,

Registration date
Friday January 21, 2022
Last seen
August 8, 2022
Jun 17, 2022 at 03:19 AM
If your computer finds a hardware error when you turn it on, it might not start. If the computer beeps or a light blinks, you can use that error code to attempt to resolve the issue.

Power reset your desktop computer
Perform a power reset (or hard reset) of your desktop computer to clear information from the computer memory without erasing personal data.

1. Turn off the computer.

2. Disconnect the AC adapter.

3. Disconnect all nonessential peripheral devices, such as printers, scanners, external hard drives, and USB flash drives.

NOTE: Do not disconnect your mouse, keyboard, or monitor.
4. With the AC adapter unplugged press and hold the power button for approximately 15 seconds.

5. After you drain the capacitors, reconnect the AC adapter. Leave peripheral devices disconnected.

6. Turn on the computer.

Identify the desktop light or beep code

If it blinks 4 times then
This condition indicates that the processor (CPU) might be overheating.