Mecer N243S8 overheating?

Hi everyone

My dad gave me his old lapy, is a mecer N243S8 but its overheating. So I opened the processor cover and removed the heat sink, the CPU was dry, no thermal paste, I applied the thermal paste but it continued to overheat. One other thing I noticed is that the fan turns, then stops and starts again in a few seconds, but even if the fan is turning, the heat sink gets hot in a matter of seconds. My question lies here, the CPU on it is a 2.4ghz CPU but when I google the model I get a 1.7ghz model, so is it possible that they could have tried to upgrade the CPU with a bigger one so the cooling system cant handle the heat produced by the 2.4ghz CPU and again if so what do I need to do?

 

Well....first i would look in the BIOS to make sure it isn't overclocked (load fail-safe defaults)....then i would replace the fan if possible.