Cant Switch off my computer :{

Question

Hi everyone My Computer RESTART everytime when i SWITCH it OFF

heres the story: my computer AUTOMATICALLY turned on few weeks ago when i was sleeping (didnt set to switch it on nor tune the registry, etc) and then everytime i try to log off from windows...it just restart... even though i push the POWER button, it just freezed.. without turning off

i've looked for many solution on the internet(including: WAKE on LAN, unplugged all USB device, tune the registry, uncheck the box to aviod restart when system failure and clean up the dust) but nth works

is there any electric shortage? how can i know? or how can i prevent it restart from electric shortage? or software problem?

i built my computer like 1 year ago this problem frustrated me recently, hope it doesnt harm the harddisk i need some help. THANK YOU VERY MUCH

Answer 1

Just to diagnose, try unplugging the power button from the motherboard.

This would be my first thought and if the problems stops then there is a problem with the switch and you will either need to replace that or the entire case.

If it still happens, I would next proceed by unplugging everything from the machine other than screen, power and keyboard (hopefully it isn't the keyboard causing this - if you have a basic PS/2, with no multimedia features or other intelligence, use that).

If it still happens after this, I would first look at the power unit to make sure there isn't a short causing it to start up. (I know that the signal is sent to it via a couple of pins on the 2x10/12 cable, but I am not sure if a defective motherboard can actually start a computer the other way round).

Anyway, if you are still having problems AND this never happened before, I think it is possible you have a defective motherboard. Try resetting the BIOS to defaults, however you may have to send it back or get a replacement board.