My mother in law gave me her old computer because it would start for a few seconds then stop and continue to repeat the process until she unplugged it. I only wanted it for the extra hard drive. After installing the hard drive into my computer (wanting to format it then clone it since it is larger than the one I currently have) it caused my computer to start and stop even being set as a secondary or slave. If I completely unhook it from my computer and start it up again, My normal set up works fine. Any ideas about what could cause this?