I accidentally used the wrong power supply to boot my external Seagate Free Agent Desk 1TB HDD. When I put the correct power supply in, the hard drive would not turn on. I removed the hard drive and placed it in my desktop. When I went to boot the computer, the computer itself would not power on. When I disconnected the hard drive, the computer powered on. Does anyone have any idea what I did, why the computer will not power on with the hard drive connected, and what I need to do to get my hard drive working again?