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My computer is located near the window, and I noticed that when I open my window, after a minute or two the picture on the screen often gets blurry and I have to press "auto" to make it sharp again. Does temperature change somehow affect hardware parameters which causes the signal to change (and picture get blurry)?

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Did you ever solve this problem? –  Josh Campbell Feb 8 '13 at 7:38
    
No, this problem still exists. I just attached a button on a wire that turns on a motor attached to the back of the monitor, that presses the auto button for me, so I don't have to lean forward each time. I guess I'll just switch to digital output when I save enough for a 30" IPS. –  user1306322 Feb 8 '13 at 7:48
    
I would chuckle at this odd fix, but I have too many stories of my own ; ) –  Josh Campbell Feb 8 '13 at 8:56

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The simple answer to your question is yes, excessive Temperature changes can effect visual output, however this typically relates to overheating and causes screen tearing, vertical scan lines, little speckles dancing around the screen, etc., but I have never seen this cause blurry images. It could be the monitor depending on age, but impossible to determine with limited info. If the computer is in a hot environment (85+ degrees) while a graphic intensive game is running, then the GPU could be exceeding its temperature threshold. Especially if the fan has not been cleaned in a while.

Some things I would try in order: - Get some compressed air, open case and clean all fans. (Power supply, CPU, GPU, etc.) - Check video cables when image becomes blurry. Does movement cause image fluctuation? - Test another monitor - Replace graphics card

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The temperatures are ok, I guess it's the temperature difference (room/outside). –  user1306322 Dec 30 '12 at 11:19

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