Thanks for the info, geezus. I'll check the beep sequence when I power down next time, and remove the GPU. Robert, thanks for the recommendation, but that's only 450w - I need 600w minimum. I'm running 2 hd's in Raid, 2 DVD drives and a 7950gx2. I bought a new PSU and it still did the same thing anyways, so it's not that.