Here's a good one. I am trying to reinstall XP Pro. I set the boot order to CD ROM and rebooted with the disc in. It goes thru the whole checking drive sequence and loading programs, then says there is no hard drive installed. I can load the OS on the same hard drive in a different computer and it works fine but when I transfer it back, it's as if it isn't there. I started on a quest and began loading the hard drive in all my friends and families computers and finally found one that worked. I can install XP PRO on my hard drive in his computer and transfer it back to mine. Why would one computer be different from another? I should add that when in bios the hard drive is listed and autodetect picks it right up. I've reinstalled a couple of times now and I always have to take my drive over to his house to install Windows.