I have just looked at an E-machines 370 computer that is constantly switching itself off, maybe after a few mins or maybe after several hours, there seems to be no consistency to it. The spec is as follows: Celeron 1.8GHz 256Mb RAM 80Gb Maxtor hard drive Onboard Intel graphics and sound. I have checked the memory, motherboard and the hard drive and all tested OK. All cables were OK. Windows Xp was reloaded a couple of weeks ago, it has been checked for virus's and spyware. I have installed a new power supply. In the couple of hours I was there it never rebooted once but has rebooted since I left I can only think that it has to be a problem with either motherboard or processor unless any of you can guys can suggest something else.