You might also check to see that the cpu is attached to whatever heat sinking device its supposed to be. Laptop fans are often attached to a thermal probe so that they only spin when the system is getting too hot. So its possible that your cpu has become dislodged from its sink and is heating rapidly. Either that or there may be something wrong with the probe. Of course, considering that if the fan is louder than it used to be either implies it was never this hot, or that the fan is damaged. Personally, I've never taken apart a laptop. I'm not sure that you want to. But theoretically your machine should function without even having a hard drive attached. See if you can get into the bios, or if you can pull the hard drive out and boot off a CD. You still might want to get it professionally repaired, but I'm less liekly to think its a hard drive issue as a fan issue.
-Eric Hattemer

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