They're right about a possible power supply problem as well.
Even if you were okay before, your PS could simply be nearing the end of it's life for one reason or another. If the Card is recieving just enough power to get it going, but yet not quite enough, funny things like that can happen.
Depending on how handy you are with this sort of thing, to check it you could open your rig, and disconnect power temporarily from some secondary drives and a floppy dirve, etc, to reduce some of the PS load and see if it helps.
__________________
|