Normally the Book will try to access the optical drive first. (whirring noise), Then it goes to the hard drive (sometimes a clicking sound). A squeeking noise can be made by capacitors going bad. Fans can make a screeching or chirping noise if going out. It all depends on the type of noise, and the location. Is this a new noise? Remove the battery and start up with just the AC adapter connected to eliminate it first. As rj asked, a better description is needed to help you.
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