I was not present when the following occured, so this is based on what was related to me... Two identical computers, both with W2K Pro. Took hard drive (we'll call it HD1) out of one computer, rejumpered for slave (I am told it was properly done, I have no first hand knowledge), and installed on primary controller of second computer. Booted up, got NTOS kernel error. Rebooted, got W2K splash screen, went no further. Couldn't boot into safe mode either. Took HD1 off primary channel, put it on secondary channel as master in place of CD Rom (again, I wasn't there to be sure of proper jumpering), same result. Took HD1 out completely, and computer booted normally. Put HD1 back in its original computer, with original master setting on primary channel, now it won't boot - gets to same place at splash screen. Tried to repair, but W2K installation not detected. Can anyone guess the most likely scenario of what happened here? I'm guessing something with the boot sector, but I'm not positive. I'm also guessing the jumpering was incorrect at some point in the process. If anyone can help me figure out what happened so I can figure out if there is a way to fix it, I'd appreciate it!