Hard Drive adding distortion

[priechm]

I'm running Pro Tools M-Powered 7.0 on a computer I built and it worked fine until I put in a new hard drive. The sessions still run from my old hard drive without a problem, but when I try to run them from my new Seagate Baracudda drive, I get a destorted clipping noise that plays back with my audio. It only does it in Pro Tools though. When I bounce tracks down and listen to them through windows media player or musicmatch they sound fine.

I was wondering if anyone knew if there are any problems with Pro Tools compatability with PCI host cards. I got a Vantec Serial ATA 1.5 PCI host controller to connect my new hard drive. I've already moved it to a new slot and messed with all the PCI latencies and my Delta 44 latencies and nothing has helped get rid of the distortion. Anyone got any ideas?

[frenchman]

Is your PC power supply powerful enough ? soundcards, PCI adapters, fast disks etc. tend to draw a lot of power.
Although this may not be the problem, it is worth checking, notably if your mains voltage is a bit weak.

[priechm]

I have a 400watt Antec Power supply that I though should be enough. I don't know though. Also, sometimes when I boot up, the Vdd voltage drops into the red but usually jumps back up. I don't if that could be why its adding distortion.

The funny thing is, I only get the distortion in Pro Tools, any other programs that I listen to music with work fine off of that drive.