I installed my new Western Digital 200GB SE drive tonight, unsucessfully. The computer will not post with the drive attached, whether it is the only device or not. I also plugged in only the power, but not the IDE cable, and the same problem occurred. Once I unplugged the HD from power, it worked fine. I'm going to take the drive to my job tomorrow and give it a shot on my work machine, just to see if it will post or if windows will see it. I'm crossing my fingers, but I figured I'd post this and see if any of you had similar experiences. btw, the hardware in question is a Soyo KT400 dragon lite mobo, and a 500W CompUSA power supply.