IRQs, drivers, BIOS etc etc
Any number of issues. Best to make sure the system works with some other card. If it does, you know it's card related (maybe drivers or software), or even the card is duff.
If the problem occurs with any gfx card, then it's possibly BIOS, OS or hardware.
<b><font color=blue>~ BIOS SETTINGS: Fast, Hot, Unstable...That ought to work. ~</font color=blue></b> :wink: