Auto switchoff during playing videos

Akki - Aug 29, 2015 at 10:47 PM

my pc have a problem that when i am playing videos in youtube then my pc automatically shuting down after 5min..
i tried lots of times but having still the same problem.This problem not occur when i am using normal internet without playing videos pc is standing long..
Mean while i changed SMPS also but there is no use..
So please Suggest me Solution to overcome this problem..