Hey Scott. I have been having problems w/ a spare Western Digital 40GB HD I installed a couple weeks ago. I had installed a CMD0649 IDE board in a PCI slot to run it off, as all my other IDE slots are filled. After I got it up and running I started having problems w/ the standby and shut down of the computer, so I disabled the WD HD for the time being and every thing seems fine. I was going to try and reinstall XP, but it said it couldn't uninstall due to the spare HD. My next move is to reinstall the spare HD to one of the IDE cables off the main board and move the 100mb zip to the CMD board. You can just disable the HD from the control board device manager and see if your problems stop.