Why is my G5 drive bay fan speeding all the time

SheerGold · Feb 22, 2008, 06:54 PM

My G5 tower is one of the early models.

Today I turned it on. Immediately the drive bay fan was running at maximum speed. The Mac's temperature was cold as it had not been used for 12 hours. So the speeding fan could not have been due to the drive bay being overheated.

The fan never slows down.

Even after a restart it immediately spins at its maximum. Plus it stays at maximum speed all the time.

Anyone know what is causing this & how to make it work properly?

lamina · Feb 22, 2008, 06:59 PM

Shot in the dark here... turn it off, hold down the power button until you hear BOOOOOOOOOOOOOOOP and all the fans spin up to max, and release.

Also, hold down -Opt-P-R to reset PRAM.

Let us know.

andy.barron · Feb 22, 2008, 07:00 PM

Hi. I had the very same problem ages ago. Set the processor performance to best or fastest (sorry i'm not in front of my G5) instead of automatic.

I believe this will sort it for you

Feb 22, 2008, 06:54 PM	#1
SheerGold macrumors member Join Date: Apr 2006	Why is my G5 drive bay fan speeding all the time My G5 tower is one of the early models. Today I turned it on. Immediately the drive bay fan was running at maximum speed. The Mac's temperature was cold as it had not been used for 12 hours. So the speeding fan could not have been due to the drive bay being overheated. The fan never slows down. Even after a restart it immediately spins at its maximum. Plus it stays at maximum speed all the time. Anyone know what is causing this & how to make it work properly?

Feb 22, 2008, 06:59 PM	#2
lamina macrumors 68000 Join Date: Mar 2006 Location: From Canada, living in Seoul	Shot in the dark here... turn it off, hold down the power button until you hear BOOOOOOOOOOOOOOOP and all the fans spin up to max, and release. Also, hold down -Opt-P-R to reset PRAM. Let us know. __________________ Black MacBook 2.4GHz, 250GB HDD, 4GB 1st Rev iMac 17" 16GB iPhone that doesn't bloody work in Korea Nikon D50 My experience as a teacher in Korea

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Feb 22, 2008, 07:00 PM	#3
andy.barron macrumors regular Join Date: Nov 2006 Location: Bedford, England	Hi. I had the very same problem ages ago. Set the processor performance to best or fastest (sorry i'm not in front of my G5) instead of automatic. I believe this will sort it for you