Unfortunately it's also possible that your card is DOA, but it's more than likely one of the above issues.
Re-seating it a few times could be a potential solution as well before you dive into the BIOS. Note that I said a few times. I had a card that appeared to stop working. Re-seated once. Nothing. Twice, nothing. Of course when I brought it in for a professional to look at it, and they re-seated it time number 3, it worked just fine. A nice $100 vacation for my computer.
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