Anyone ever get this BSOD error?

This is the error I get if I leave my system running Prime95...

"c000021a unknown hard error"

Anyone have any idea what might be causing this to come up?

Yeah I've seen errors like that before. It could mean one of a few things. You have corruption on your HD. Or, your HD is failing.

Thats strange, since all I have on the hard drive are the drivers for the hardware and some benchmarking programs...

But it makes sense, because for a few minutes, the computer wouldn't boot because it couldn't read the disk...

Also, a couple times, I got a flashing screen at boot saying that the power cable for the video card (its a Radeon 9800 Pro) was not connected to the power supply, even though it was...

But now it seems to be working fine...

i would think a failing hard drive.