hello i have a gateway w323 it is a celeron 1.5yesterday i was working fine but then i bought a p4 2.4 i just fit in the motherboard so i put in and put the same fan and heatsink , tryied starter it wont start the llaptop then i put it back everything with the celeron and now my fan wont turn on can you help me pleasseeee i dont know what to do ? should i replace the fann????or is the motherboard