I have emailed Asus of the problem, but got no reply yet, so I wondered if anyone here might know the answer. I have the Asus A9800XT graphics card based on the ATI Radeon 9800 XT. My motherboard is the Asus P4C800-E Deluxe. The problem is that Smart Doctor (the performance-monitoring software which came with my VGA card) keeps reporting that there is a fault with one of the VGA card's fans and the fan needs to be replaced. However, when I check the card, both fans are spinning fine. Sometimes, Smart Doctor says there is not enough voltage coming from the motherboard for the VGA to function properly. If I leave Smart Doctor running for too long (a couple of minutes even), my computer crashes and I need to reboot. If I shutdown Smart Doctor, my system doesn't crash but then I don't have the Smart Doctor to control and protect the card's temperature, fan-speeds, etc. How do I fix the problem? Is there a way I can increase the voltage (through the motherboard BIOS) going to my VGA card, if low voltage-setting is the problem? What voltage do I need going through the AGP socket for the VGA card to function reliably? Or does anyone know of a recommended setting on Smart Doctor that can fix the problem? Thanks.