I see some similar threads, but nothing that answers my specific problem. I ordered an HP desktop system off ebay, with windows 7 on it. Every time it boots up, it gives the error message in the title. It goes by quickly, and eventually gets into win7, but I'd like to make this go away. It says "intel boot agent", maybe some other stuff, then "media test failure, check cable". Another thread suggested moving hard disk to the top of the boot sequence in bios, but this had no effect. I'm not sure why an unusual boot sequence should result in an error anyway... Thanks for any help.