Need help! I built a new computer that since day 1 wants to reboot every so often. The problem is that when it tries to come back up, I get "Disk boot failure, insert system disk and press enter". Sometimes I can let it sit on for a day before this happens. And it usually takes rebooting several times before I can get windows back up and running. It runs great, when it runs. I have replaced the HD with another new one, and also replaced the cable from the drive to the MB. This still happens. Any suggestions?