Help! my laptop hangs

Ceejay0918 Posts 1 Registration date Wednesday August 13, 2014 Status Member Last seen August 16, 2014 - Aug 16, 2014 at 04:05 AM
ive done a complete reformat just to make sure there aren't any virus. and also check my disk for some errors/bad sectors. and it's clean. ive also removed the dust that is blocking the vents. but the fan is a bit noisy when windows starts,.

so is the fan the culprit or my graphics card because my graphics card is nvidia geforce 8600???