I have an acer aspire 5315-2290 laptop that every once in a while shuts down without warning. It seems to shutdown less when it is not hot but I checked the fan and it seems to be running. What I was about to do is take it apart and clean the dust of everything but I dont know if its overheating shorting out or what. Somebody suggested to me that I need a new motherboard but I don't want to just buy one. Does anybody know what the deal is?