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iMac fan noise...vacuum cleaner loud.
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Senior User
Join Date: Aug 2007
Location: U.K.
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iMac as sig.
Had it a few weeks, refurb model.
Just after turning on, a few days ago, within a few secs, very loud fan noise, first time happened.
Fan quiet after a minute or so.
Didn't check temp, or vents.
Room temp low, around 20ºC
Not happened since,
Ideas ?
(Last edited by MacNNUK; Oct 22, 2007 at 08:01 AM.
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iMac Intel Core i5, 2.5GHz, 4GB RAM, 500GB 21.5" Monitor 10.7.4.
iMac 17" 2.0ghz Intel Core 2 Duo w 3gb memory (White one) 10.6.8.
Internal 500gb / 160gb plus External 500gb x 2 (2x Time Machine)
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Administrator  Join Date: Apr 2001
Location: San Antonio TX USA
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Try rebooting and see if it happens again... It may have been a one-time thing.
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Glenn -----
OTR/L, MOT, Tx
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Senior User
Join Date: Aug 2007
Location: U.K.
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Originally Posted by ghporter 
Try rebooting and see if it happens again... It may have been a one-time thing.
As it happened a few days ago, I have already rebooted a few times.
Perhaps it was a one-time thing.
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iMac Intel Core i5, 2.5GHz, 4GB RAM, 500GB 21.5" Monitor 10.7.4.
iMac 17" 2.0ghz Intel Core 2 Duo w 3gb memory (White one) 10.6.8.
Internal 500gb / 160gb plus External 500gb x 2 (2x Time Machine)
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Professional Poster
Join Date: Nov 2004
Location: Belgium
Status:
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My iMac's fans sometimes go for no apparent reason on full blast. It has only happend 2 or 3 times in the year that I've owned it... Nothing to worry about I guess.
They run a few seconds (can't put a number on it) on full speed and they spin down very slowly.
I'm on a 20" 2.16 C2D iMac.
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iMac 20" C2D 2.16 | Acer Aspire One | Flickr
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Junior Member
Join Date: Jun 2004
Location: Toronto
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I think after a particular software upgrade my iMac G5 fans went like crazy until it had completed updating... it sounds very alarming but I wouldn't worry about it unless it starts to happen more often.
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Junior Member
Join Date: Jul 2002
Status:
Offline
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My iMac's done the same thing, only about 3 times in the year that I've had it. (first 24" model) I can't explain it, but I don't think it's a problem.
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Moderator  Join Date: Apr 2000
Location: Gothenburg, Sweden
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It does that. On the iMac G5, the fans are controlled from OS, so if there is no contact with the OS for a while (as when it hasn't started yet) it will blow full blast to be on the safe side. I assume that the Intel models do something similar.
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Mac Elite
Join Date: Nov 2006
Location: here
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Could it be that you had the firmware update running?
Or that your iMac was in FireWire mode? (holding down the T-key during start-up, and getting the bouncing firewire symbol on a greenish grey screen)
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GUI Punk
Join Date: Jan 2002
Location: S.E. Mitten
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Mine did it a few times when I had bad ram and it kept kernal panic-ing.
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24" AlumiMac 2.4ghz C2D, 4g Ram, 300g HD, 750g USBHD • 80g iPod • 160g ATV • iPhone 3g
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Fresh-Faced Recruit
Join Date: Nov 2006
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I have had this problem with mine as well.
Apple Extended Warranty:
The program is available for certain first generation iMac G5 models that were sold between approximately September 2004 and June 2005 featuring 17- and 20-inch displays with 1.6GHz and 1.8GHz G5 processors.
The affected iMac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below.
Serial Number ranges:
W8435xxxxxx - W8522xxxxxx
QP435xxxxxx - QP522xxxxxx
CK435xxxxxx - CK522xxxxxx
YD435xxxxxx - YD522xxxxxx
Some second generation iMac G5 computers have serial numbers that fall within the upper band of the ranges listed below. Only first generation iMac G5 computers are affected by this program.
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Newton 2100, 1400CS, Lombard, Cube, PB867, iMac G5
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Junior Member
Join Date: Oct 2007
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Meh old thread but what the hey. My iMac G5 did this to me once of start up. Surely enough the fans went down so....soooo...soooooo.... slow. But it hasn't happened again.
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Moderator Join Date: Apr 2000
Location: Gothenburg, Sweden
Status:
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Seriously, just read my post above. OS X from a certain version on has a routine that controls the fanspeed on G5s. If, after a certain delay, that routine has not started, the fans are run at max speed. Same if the OS has crashed, again after a certain delay. This is not a flaw - it is by design. Same thing happens if you boot from an OS that doesn't have the routine - the hardware test CD is one example. The flaw fivell is talking about is something different with a different symptom.
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