And just one more link for good measure.
http://discussions.apple.com/thread.jspa?threadID=1731179&tstart=0

Wish I could edit posts.;-(

Stewie

From: [email protected]
Subject: Mirror Door G4's overheating
Date: Sun, 1 Nov 2009 22:06:24 -0500
To: [email protected]


        I bought my pair of mirror door G4's new and the fans were noisy. 
People complained about the noise. Apple came out with a firmware update that 
quieted (Slowed) the fans. Recently my G4's have begun to simply quit. I 
suspected overheating so I installed Antec Super blowers in the upper PCI slots 
(This big blower takes up two PCI slots) and this solved the problem.  My 
theory is that Apple's firmware update slowed the fans and predisposed the 
mirror door G4's to overheating problems, especially after they get older and 
dustier.  Does anyone know if I can go back to the original firmware and get 
the noisy but more effective fan speeds back?  Thanks,  James K Morgan 




                                          
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