Fan on all the time for about 1 week

Hi
I'm the still happy owner of a almost 3 years old powerbook G4 12". I have been troublefree so far when sudenly things started to go worng last week
1) I had the "privilege" to experience an hard drive "crash" (http://docs.info.apple.com/article.html?artnum=302411) related to disk utility. It took me 1 day to recover the data, then reformat the drive and reinstall 10.4, and apply update software all the way to 10.4.7 and other seurity update (Whoaaa that was long)
2) NOW: Since then my fan is on all the time. As soon as I start the laptop it's on and it goes off only if I put the laptop to sleep (or shutdow of course).
I did check sensor temperatures and everything is within range (even on the low side)
Battery 31degC
Graphic Processor Die 51degC
Hard Drive Bottom Side 40degC
Processor Top Side 43degC
Smart Disk Fujistsu 44degC
I have noticed a "2FAN/7/4: Fan for main enclosure" error using Apple Hardware Tool... Does that mean that my main circuit board is not working or that the fan controller is burned !!!
Anyway it's really annoying and I have seen that I'm not the only one suffering "the Fan Always On" syndrome....
http://discussions.apple.com/thread.jspa?messageID=1788983&#1788983
Any help from users or moderator? Is it temporary or do I have to bring the laptop to an apple repair centrer. The laptop is already 3 years old and I dont not want ot spend to much money on it. I'dd rather get a new one if the repair cost is too high.
Any help will be apreciated...
JB

Well if you had bought AppleCare, it normally would be free. Though if the machine is older than three years, or out of AppleCare, it may be more expensive. I've found these two places often charge less than AppleCare to fix out of warranty Powerbooks:
http://www.dttservice.com/
http://www.powerbookresq.com/

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