My fan spinning full speed, no appareant reason.... Help!!!

I have my pb since septemer 2005 and 2 weeks ago, the fan inside the book started to ran for nothing, the cpu usage is low, temperature ok (45C), i've tryed a fresh install of os x 10.4, to zap pram/vram/power management, to reduce cpu to minimal setting, apple hardware test and it did nothing. Now the fans of my PB run full speed 50 % of the time, even during startup... It's annoying (it sounds like a pc)
It's the fan at the right, maybe under the right speaker or something like that
Help would be apreciated, thanks

no usb drive plugged...
(and the fan also start sometimes without the ac adapter)

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Well the problem is fixed. I did call Apple Support and they ran me through the hardware utility. The problem I reported was that the system took forever to startup and that once the fan ran at full speed for no reason. I was not aware of the slow boot when I wrote this question so did not refer to it. But, after the DVD debacle my iMac would hang on the black screen just after the chime for about a minute or longer. The system worked fine once booted. This long boot came from both restart and a cold start. Think it happened once when I was trying to wake it from sleep yesterday, that is when I shut off the 'puter with the poer button. Anyway, the disk utility showed no problems
The Apple Careperson was very nice and stayed with me until the issue was resolved. It turnes out that unplugging my USB hub cured the slow bootup problem, and probably the fan.
So I am guessing that something in the external DVD hardware went and damaged the USB hub. It would be too odd for two devices to fail, on their own, at the same time.
The good news is that I just found a nice LaCie external DVD with firewire 400 support, so guess what I am buying.
As for the USB hub, well without the external DVD I don't need it right now so will wait to replace it.
Thanks for your help and I hope this may help someone else down the line.
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My 3 month old iMac 24" has just started having fan problems.
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I tried again, following your instructions exactly. It seemed to work, running normally for about an hour.
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This question was solved.
View Solution.

Hello mpw101,
Seems like there was some confusion on the products your received and how it was explained. I have forwarded your thread to the appropriate team for review. Someone should be in contact with you shortly so you can discuss your HP customer care experience.
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Mechanic man thanks for the response.
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My fan spinning full speed, no appareant reason.... Help!!!

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