Question Windows 10/11 with two monitors; periodic malfunction of one monitor

[PaulKraemer]

Hi,

A colleague of mine has a PC running either Windows 10 or Windows 11. He has two monitors connected. Both monitors work almost all of the time. About once a day, however, he has said that the display on one monitor becomes unreadable. He described it as appearing "fuzzy". With no action on his part, it starts working again within about a half an hour. The times at which this happens seem to be random, and he has not been able to correlate the timing with any particular activity he performs on this PC.

I have not seen this happen myself yet and I have not yet had the opportunity to see how the two monitors are connected (HDMI, DisplayPort, etc). Before I have this opportunity, I am hoping someone here might be able to suggest anything I should check that might typically cause an issue like this.

Any ideas will be greatly appreciated.

Thanks in advance,
Paul

 

[Ralston18]

Colleagues's PC - update your post to include full system hardware specs and OS information.

The first thing would be to swap in a known working video cable to replace the existing video cable on the problem monitor.

Try swapping the monitors' positions - determine if that makes a difference.

Swap in a third known working monitor for the problem monitor.

Move the problem monitor to another known working (no problems) computer.

Objective simply being to determine if the fuzzy problem stays with the current host system or follows the monitor.

For the most part, my thought is that the problem monitor has some heat related problem. Gets warm/hot and something shorts out or otherwise fails. Once cooled down again all works again until the culprit heats up once more.

Key is to isolate or determine the problem as being solely the monitor. Proceed from there....