Blue dots on my computer screen?

Nik

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I've got a 22" BenQ LCD (I think its LCD). Just recently, in the past week, when I try to play full screen games like Dungeon runners, WoW, and even runescape in high detail, my screen fills up with lots of little blue dots, and if I don't cancel the game it freezes, my screen flashes and turns all different colours. I can do everything else a computer can do, and it will be fine.
This has only been happening for 1 week or so, and I've had this screen and computer for about 4-5 months. I've done plenty of virus scans and found nothing.
Any solutions?
 
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