Pc monitor problem. Keeps rapidly dimming and brightening.

Worse, it's... it's... I'd call it flickering, it's happening right now as I type this post up and it's killing my eyes.

I don't know what the f*** happened. This was going on yesterday, so I turned the computer off and then switched it back on today and the same story.

I don't know what could have caused it. I ran both Microsoft Security Essentials and Malwarebytes. They detected nothing, so I don't know if it's virus related.

I'm currently running a Windows XP service pack 3 computer, been with me for just over 4 years.

This has never happened to me before, and it's not subtle pc brightness flickering, it's very noticeable and very rapid. It stops doing that for a few minutes, then resumes immediately. I don't know what could have happened.

I guess these are a fewthings you can test to narrow down the problem a bit.

Test the monitor with something else hooked up to it, using the same port. If it still happens, try using a different port. If it still happens, I would say the monitor has seen its days. Try also with different cables.

hey i have had the same issue if you have your monitor with a vga cord it will do that try using an hdmi cord and if that dosent work try lowering or increasing the refresh rate of the monitor

Any chance you can try the PC with a different screen or the screen with something else? Even try a different input (e.g. VGA, HDMI, DVI depending what you're using).

Have you tried changing monitor settings, like dynamic contrast etc?