I just installed a new Radeon HD 7770. When I go into the bios, it looks like this: http://imgur.com/QElzD Furthermore, whenever windows is loading, the monitor goes blank and the computer seems to freeze. Is it possible that I got a bad card?
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IF thats the only thing you have changed then more then likely a bad card
Those are called artifacts it means that your card has a defect in it whether its a temperature thing or something under the hood something is wrong with it and you should replace it.