I have an NVIDIA 6600 Gt and its got problems...
When I play World of Warcraft or any other game the graphics start blinking this weird red/green color, I believe its called "artifacts"???
Anyways, Ive also read that it can be caused by the Power Supply...
I have 250w in mine...is this enough? Please, please help me Ive had this problem for months and nothing is working!!!

No that is not enough! The box says a minimum of 300! I would recomend no less than 400 though. You are serioulsy damaging the components of your computer by not providing them with enough power. I suggest you purchase a higher wattage one asap.

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