Im stumped! I just added a new external hard drive and now have issues with powering down. The drive is a 640 GB Western Digital Caviar housed in a Rosewill RX-358 case (SATA) and its connected to my Dell Dimension 4600 via a USB cable. If I boot the computer with the new drive connected, Windows XP (SP2) hangs at the blue screen that says Computer is shutting down. I can press the power button and it shuts off. If the computer is running and I connect the new drive, no problem. It shows up as H:, I can read and write to it, and Windows shuts down normally. I also have another USB connected external hard drive (Iomega 160 GB) and it doesnt cause any problems. I would really appreciate any thoughts on how to fix this problem. Thanks!