Check for the switch when you power on the computer if it stuck while pressing it, if so put some small amount of oil in the corner of that switch, if the switch has no problem when you press it open the computer make sure its not plug in then remove the heatsink that has a big fan and four lock on its side using a screwdriver remove the dried thermal paste replace it with new thermal paste you can purchase it from any computer store then make sure that you put a small amount only half the size of the peanut then put back the heatsink again screw to lock in place make sure not to over lock it
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