Replaced the old one because it wasn't large enough. When I installed my second HD, I had to unplug my DVD rom to make it boot.

Their site seems to be working now, so maybe i'll send their tech support an email. But the error I was getting was a page full of chinese symbols and other mumbo jumbo.

The PSU was boight on newegg, and I checked the voltages before I plugged it in, everyseemed ok.

As for the noise. It is screaming, theres no beeps. It literally makes a siren noise, just imagine a slimmed down firetruck. I'll go ahead and try flashing the bios. Nothing in my machne has ever been overclocked. As for the AGP slot question, I never even touched it, so I doubt it moved on its own. But anyways...Ideas, anyone else have some? Or is this siren thing like uncharted territory?