I just purchased a Seagate 750 gig external hard drive. My computer (running Windows XP home edition) will not boot past the screen where the devices are recognized as long as the Seagate is physically connected. I have to disconnect either the power cord or USB cord to the Seagate and reboot. Once the computer has booted, I can reconnect the Seagate cable and everything works great once the system recognizes the external drive. PLEASE...any suggestions?