I have had this ongoing problem since the begining of September. You can turn the computer on and everything works fine. The problem is intermittent, it can happen within minutes of being on or after hours. The computer will go totally blank (black screen) and reboot itself. This will continue to happen intermittently until the computer locks up in the reboot mode, all the computer, disk, and CD rom dirve lights are on an it is just frozen in that state. I have in the past just shut the main power off to the computer for a period of time and the process starts all over upon restart-up. I thought it was a power supply problem at the innitial onset and purchased a bettery powered backup and surge protection. This obviously did not solve the problem. I have taken it to the computer repair shop and they could not find anything wrong with the computer.
I have tried swapping out the internal power supply and the problem still persists. What is the next logical step for discovering what is causing this issue.
Please help me with this problem anyone.