Why does my computer turn off for a few seconds?

Why does my computer turn off after 5 seconds?

• When I press the power button, my computer turns off after five seconds and restarts. There is no beep or monitor output, while my monitor used to turn on in 3 seconds. It worked properly a day ago. It stopped working properly since I opened the computer but forgot to set the CPU fan properly and the CPU temperature reached 110C and it turned off immediately. I have and ASUS P5B and a core 2 duo 6300 processor and know someone whose computer worked for days at 95C temperature with the same motherboard and CPU! Does turning on, restarting after a 5 seconds delay, and not bringing any screen at all mean the CPU is damaged? Don't forget that the computer doesn't beep too. So every part is ok except if the parts test has not begun yet. That means a burnt CPU or motherboard. There are no smells whatsoever. Does anyone know which part is damaged? Could the motherboard get damaged in that incident and could it detect burnt CPU? Could damage to either one cause any damage to other parts?

• Answer:

  since your computer does turn on even if it is for a measly 5 seconds, it means that your CPU is not burned but since it was exposed to such an extreme heat of 110C which is ABOVE BOILING POINT!!!!!!!!!!!!!!!!!!, you have to remove the heat sink from your processor. then you have to take your processor out and put new thermal paste on (i recommend artic silver 5) then mount the heat sink on PROPERLY, and turn on your computer. it should work. if it doesn't i think that you have to buy a new processor because your processor is still thinking is in dangerous heat and it protects itself by shutting down.