I have a Dell Dimension 2400 and having problems with power. The computer continuously powers itself off and then back on then off and on etc. It will do this every few seconds and most times it never finishes the boot process before restarting again. It will restart if i am in safe mode or in the bios and sometimes it turns off and on so fast it is just clicking and never even posting. if i shut it down completely by holding the power button until it shuts off it will turn itself back on. occasionally if i let it rest for a week i can run it no problem for a day or 2. Sometimes it will not power back on no matter what i do or press. I have switched power supplies and that didn't do anything. I can't re-do the OS because it never stays on long enough. I want to zero fill the drive and reinstall the OS in case there are nasty trojans in there but can't get it to be stable long enough. I have other motherboards but can't use them in this small form factor case so i have no quick way to eliminate the MB as a problem. Has anyone heard of this before and can you guide me towards a way to stabalize the system?