Display turns black now and then

[michielsno]

I have a HP Pavilion 27 AIO PC 27-xa0680nd, windows 11, although I think my problem is not limited to this specific PC.

The problem is it sometimes shows flickering horizontal lines, then it flickers to black and finally totally turns to black for time periods of several seconds to several minutes.  Then it returns as if nothing ever happened. Sometimes it works nice for hours and suddenly the defect shows up again.

Here's a list of what I have tried:

1. update BIOS.
2. diagnose tests fromout the BIOS
3. Another power outlet
4. Another harddisk
5. Windows 7 and 11 installed on the new harddisk
6.  Removed one of the two memory banks and tested the system with one bank. Then tested the other memory bank
7. Disconnected both small printed circuit boards of the side buttons, after booting
8. NVidia card removed
9. Tried a new motherboard
10. Tried a new adapter
11. Reconnected all cables inside the PC

The only thing I haven't tried so far is anoter CPU and another display. My gutfeeling tells me it is not the CPU, since it happens so unpredictably, but maybe I'm totally wrong there. Moreover, the video card is in the CPU. 

I'm now about to try a new display screen, but since its not so easy to get the special tape for reassembling the rear cover, I decided to ask you guys first what you think of it. So my question is, does anybody out there ever had a similar case of this flickering and what was the cause?

[zoey7886]

Hi @michielsno,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to assist you.

I understand you're experiencing an issue with your PC screen flickering.

I apologize for any inconvenience this may have caused, I'm here to help you today.

Follow the below steps to access the BIOS menu and stay on the screen for few minutes to isolate the issue.

1) Hold the power button for at least five seconds to turn off the computer. (Wait for a few seconds after releasing the power button)

2) Turn on the computer and immediately press Esc repeatedly, about once every second. When the menu is displayed, press the f10 to access the BIOS menu.

If the issue appears on the BIOS, there is an issue with the hardware.

Or

Kindly refer to the steps on this link to perform advance troubleshooting.

If the issue still persists, please click on this link to perform a recovery on your Laptop.  (Take a backup of the data before performing a recovery)

Please mark this post as “Accepted Solution” if the issue is resolved and if you feel this reply was helpful click “Yes”.

I hope this helps.

Take care and have a great day ahead!

zoey7886

HP Support