Strange problem with flickering graphics

November 20, 2009 at 15:49:55
Specs: Windows Vista
I have recently experienced an odd returning problem with my computer.

The first time I start a game after I turn the computer on the graphic flickers and flashes in green shades until I interrupt the game again. If I however starts the game up again afterwards everything seems in perfect order. It only happens with the first game I start, but it happends every time and it doesn't seem to matter what game it is.
The computer can sometimes have been on for an hour or two before I start a game for the first time, but how long the computer has been on does not seem to change the outcome.

I don't see any other problems on my computer which seem related. The games with flickering graphics on first start-up runs fine when started a second time. Mysterious ...? What causes this? Any suggestions is welcome.

I have two ATI Radeon HD 4870 cards and I'm running Vista.
Dxdiag reports no errors and I have updated the graphics drivers since the problem started.

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November 20, 2009 at 16:34:14
Are you changing resolutions when starting games?

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November 20, 2009 at 17:31:19
No, I run most games in 1280x1024 which is also my normal screen resolution.

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