did you make build this yourself? It might be over heating. see if you can get into the BIOS and check the temp.
try to reset it. eather find the jumper by the slive butten battery and move the swich to reset. and press the power butten. or take the battery out and remove power cord and wait a minut and put it back in
depends on the motherboard. one thing you can just try it to reset it. eather find the jumper by the slive butten battery and move the swich to reset. and press the power butten. or take the battery out and remove power cord and wait a minut and put it back in