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After replacing the heatsink and power supply, the monitor got very fuzzy and grainy.

I have changed the cable and even replaced the monitor but the issue remained. It seems that the monitor is ok and it has something to do with the PC itself.

Any ideas?

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On board or external GPU? –  Dave Dec 17 '12 at 14:28
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What's the monitor's native resolution and is that what Windows is set to use? –  Pier-Luc Gendreau Dec 17 '12 at 14:29
    
Hi Dave, it is on board integrated intel GPU and the resolution is 1600*900 and it is the default monitor –  Hamod Dec 17 '12 at 14:40
    
i have updated the the the GPU and and the problem remains and conncected and disconnected the cable and nothing happened –  Hamod Dec 17 '12 at 15:09
    
Some old Intel GPUs do not support widescreen resolutions, let us know the exact model. You can find that info in Device Manager and then under Display Adapters –  Pier-Luc Gendreau Dec 17 '12 at 15:58

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