I have tried everything I can think of and this system just keeps rebooting. I have put different hdd’s on it thinking it was corupt or the bootsector was bad, but it does the same thing. I have changed the hdd cables on the motherboard, they were okay. it shows up in the bios, so the board is finding it. I ran several diagnostics on the system and I got one error message that the hard disk controller had a failure. Otherwise, everything checked out. This system is just one year old. I cleaned all the fans and checked the cpu and ram. The power supply is fine. It started rebooting itself when windows was up and running, now it doesn’t even get into Windows. It just keeps rebooting after the “Enter Bios” message comes up. Everything is Bios is fine. If anyone has any ideas I would sure appreciate it. Thanks.