I had exactly the same problem a couple of months ago, same video card and about the same age (3 years). I reseated the card and checked all the cables and connections, but ended up getting a new card. That was it. I got a rebuilt card from Dell for about $75 -- supposedly a better card, but who knows. You can probably find a better deal online, but I went for it and it fixed my problem so I'm happy.
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