Computer randomly shuts off

[PointmanW]

my computerhave been randomly shuts off, recently. when window start up, it alway as for disk checking even when i let it check countless time already,and when the computer turned off, anything that not in the case still working (mouse, keyboard, usb flash driver still have their light on)

 

[Hawkeye22]

It's most likely a bad power supply. If you've got a spare, try swapping it out. It may also be getting hung up when trying to enter sleep mode. Check your event viewer for possible clues.