Have a custom built computer here, it keeps turning off a short time after it is turned on, the harddrive is reformatted with no OS, any possible ideas to why this machine keeps turning off
Could also be a virus or worm. I had this happen even after a harddisk reformat but I used the "Quick Format" option and when I did the full it took care of the problem.
But Trotter covered most potential hardware problems
My first reaction is to suspect your power supply since it is just shutting off instead of rebooting. Second reaction is overheating cpu. Can you turn it back on immediately after it shuts off? Check your CPU temp in the BIOS right after it happens.