PC cannot shutdown but keep restarting when trying to shutdown

[thepink]

My PC keep on restarting when i want to shut down.
At first i thought my Windows 7 problem but then when i reinstall Windows the same problem persist
Also when i leave the computer on for too long it goes to sleep but cannot wake up after that even the PC is still running. I change to another power supply also cannot.

Anyone knows what may be the problem?
thanks in advance

 

[jtjt00]

TS, list down all the parts of your desktop here.

 

[congrade07]

It may be your USB devices (Mouse or Keyboard). Go to device manager > Mouse/Keyboard > Right Click go to Properties > Power Management > Uncheck "Allow Device to wake up computer".

Hope it helps coz it had happened to me before. Remember to do this for both mouse and keyboard

 

[peterchan75]

High chance that your PSU is faulty.

 

[jskc3617]

My system listed at right side had frequent restart issue. Change rams, gpu, monitor and mobo sometimes still happen. Before test with another psu and hdd, I test with another psu power cable. So far no restart issue.