sounds like your video card is broken.
try this: make a screenshot when you see those colour noise again and post it here. if we can see it on the screenshot, then your monitor is fine.
open the case and look if the fan of your video card is working properly
anyway, those colour noises are a typical sign that your video card is kaput. simply change your video card
and next time, don't waste your time and post any computer problems in here, these guys won't help you. there are forums for this issues.
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