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I have 2 monitors. First plugged into nVidia graphics card and second one into the on-board graphics card. Main (1st) monitor is working perfectly fine, but the other one has random black spots like these:

1

They appear when I click on icons, or try to select something on the desktop. I've noticed that it usually happens when I work for a while on my main monitor without touching the second one. These spots usually disappear 2-5 minutes after I hit F5 on desktop. Any clues?

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What operating system are you using? Be as specific as possible (version, 32-bit or 64-bit, and so on). –  David Schwartz Mar 4 '13 at 11:44
    
64bit win8 pro, 2xPhilips 241SL, nvidia gtx 650 –  Wickd Mar 4 '13 at 12:11

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