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Monitor goes into power saving mode and computer hangs shortly after

Last response: in Computer Brands
September 29, 2009 4:48:50 PM

Hi, I've crawled all over the web. Randomly when doing desktop processes my monitor goes into power saving mode, but can still hear sound coming from my computer for about 5 seconds, then it hangs.

I checked seating of my ram and did memory test on it. I examined the capacitor on my motherboard. My power supply is only a year old, 430Watts Thermaltake. all the fans inside my computer are working. I replugged everything. I tried system restore to a day before this happened. It has only happened once since the restore.
This problem began while playing a game called Medieval 2 : Total War, and upon exiting the game I loaded up Firefox, then my computer restarted.

Could a driver file or something become corrupt? The only piece of evidence I have is a event log error that has to do with the video card bios, but I only received this error once on the event log, when this problem occured about 3 times this week.
I have to wait a lot of hours or a whole day to see if something new I do fixes problem.

First time : Exit Medieval 2 : Total War, then clicked on firefox.
Second time: Tried to do a spyware scan,(was able to finish it after restoring)
Third time : Watched video inside Firefox and tried loading up catalyst control center

Thank you for your help.

This puzzles me because I can play a taxing PC game that pushes my computer to the limits for hours on end, but the moment I do something small on desktop like watch a video and chat with friends, there's a chance this problem happens. Could someone please shine some light on this?

My system is a HP pavilion a350y.
September 29, 2009 5:30:10 PM

Can't edit my post, but I just wanted to add I have a radeon x1650 pro 512mb AGP8x card.

I just completed a full set of diagnostics, scanned all my video card memory, and tested it, all tests passed. I did the same with motherboard, and all tests came back good.