I have a Dell 15 N5040. The CPU fan died on me for no reason. I removed the keyboard and palm rest to find that the laptop that was bought brand new was missing the "4th" screw -- the one the ties down part of the thermal assembly to the video chip. I replaced it with a new fan -- and the fan spins on high constantly and failed the Dell Diagnostics. So I decided to try ANOTHER new fan -- plugged it in and same thing. Can anyone tell me what the problem could be? Could it be the fourth screw it's missing? It's not dust buildup or heat issues. Thanks.
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