Fan not turning on...

Hey guys, hoping you can help me out.
My fan is not turning on and the case is hot to the touch. Noticed this a few days ago. Usually the fan turns on before it gets this hot.
I have run Cocktail maintenance and I have reset the PRAM, but still no go. I also have noticed that my machine chokes up doing simple things such as swithcing applications—like from Safari to Mail or Preview. Nothing overly CPU intensive.
Any help is greatly appreciated!

BGreg,
Turns out, my HDD was going bad. I actually found out yesterday morning when my machine froze during boot-up (spinning pinwheel). I booted from my Tiger Disc and ran Disc Utility...Low and behold the "Failure" warning from the S.M.A.R.T.
To answer your question though, I actually did run Activity Monitor during those fwe days and the cpu load was low. I didn't have my Hardware Test Disc since I am on vacation. Also don't have a processor temp application. DO you have any suggestions?
Anyhow, I had to call Apple Care to make sure they can cover the repair of my Pbook while I am on vacation here in the Philippines-which they do since APP is global for portables
NOTE: If you don't have Apple Care with a Powerbook, I highly suggest it. It's worth the piece of mind. My PBook was just 3months out of the 1yr Hardware Warranty.

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