I recently acquired a Toshiba Satellite M45-S355. It was actually given to my wife so I have taken on the project of trying to get it running. It also came with an external hard drive. When I originally tried to boot up the computer all I got was the Toshiba logo screen and I would occasionally get an error message that said PXE-E61 Media Test Failure Check Cable. After asking a few questions of a friend I checked the hard drive. Turns out there was no hard drive at all. I took the external drive that my wife had been given with the computer and opened it up. It was the exact same model of hard drive that had originally came with the M45-S355. I installed the hard drive into the lap top and it worked perfectly except for one flaw. I still get the same error message mentioned above and then the computer loads up properly. Once you try to shut down or restart the computer it will not reboot for approximately one hour. Any help on this would be greatly appreciated. Thanks.