if the video card is bad then it wont work, that when you know to take it back. for example, if you Properly install the card and you get a blank screen, or the card doesnt power up, then it might be bad. I stress the work Properly
It is not always so easy to tell if your card is bad. I had an Asus 6800GT, that worked fine in windows, but would hang the computer up if I tried to go into BIOS. Weird as hell, but I sent the card back, was sent a replacement and had no more problems.
If there isn't any video, or you get corruption in the bootup screens that come up before the OS loads.....or if you smell burning I suppose....that wouldn't be good:)
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