If you have a working fan and it is properly connected with laptop motherboard and by bad luck it's not spinning as usual.
First of all try to update laptop BIOS and if still nothing fixed then come down to CHIP LEVEL treatment of laptop. Now only two thing you can do to make laptop again working.
1.Check +voltage and senser track from fan connector, find out the CPU fan PWM controller circuit
Thursday, March 10, 2011
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