It's not likely, but your OS may need some fine tuning. But definitely substitute the card, as everyone suggested. Check for any grounding issues. Is the graphics cable snug? Has it been damaged? In other words, is the cable properly shielded? If it isn't, this can lead to ground problems. And removing as many devices off the same line certainly doesn't hurt (i.e., gaming console, TV, DVD player), for you suspect the power supply may be faulty. Is there any reason to suspect physical damage of the mobo itself? That is, what have you done before and since this problem ocurred such that the mobo would be more than likely suspect?