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View Full Version : Imac G5 very loud noisy Fan constantly stuck "on"




boris.jones
Jan 12, 2008, 04:01 PM
I was enjoying my quiet new mac until today -- disaster has struck!!

This is not a G5 apparently! but is the new aluminium 24" imac!
Hardware Overview:

Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 4 GB


I have a new problem my Imac is only a few weeks old . Turned it on today after being completely off over night (with power supply off also) and the moment I touch the on button the fan kicks in full blast and never NEVER goes off - every time now - its a problem!

Will get my apple care on it on Monday but is this a common problem?

The fan has never come on before what ever I do!

devastated this was the quietest machine ever!



mad jew
Jan 12, 2008, 07:52 PM
Very strange. Maybe try resetting the SMU (http://docs.info.apple.com/article.html?artnum=301733).

JBaker122586
Jan 12, 2008, 08:45 PM
How did you get a new G5?

Dustman
Jan 12, 2008, 08:51 PM
How did you get a new G5?

wondering the same thing. Didn't they go extinct in 2006?

Theatrics
Jan 12, 2008, 10:20 PM
Maybe its new to him.

On your issue: There is a file in the system that contains the information that controls the fans. Maybe some research on google can help you figure out how to reset this service because it sounds like somethings stuck.

It may help to look into this application: http://homepage.mac.com/holtmann/eidac/software/page5/page5.html

It controls the fan speeds of your machine, but be careful, high RPMs can damage your fans. I wouldn't use that app as a solution to your problem, but maybe you can contact a developer and figure something out? Contacting apple couldn't hurt either. (ask for a product specialist thought)

boris.jones
Jan 13, 2008, 11:02 AM
How did you get a new G5?

I dont even know what computer Ive got - its a new alu 24" Imac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo


Sorted the problem but still not happy that it ever happened!

Someone somewhere mentioned tilting the unit forward - and like a crazy fool I did. Of course the power plug popped out and shut it down dead instantly! and on start up problem solved back to normal - though it was an accident and not reccomended.

A standard restart or shutdown restart did not help even on a stone cold imac.

will try other advice found here next time - its def a manufacture fault - a haphazzard thermostat of some sort! not good for such an expensive machine

Consultant
Jan 13, 2008, 11:11 AM
Why do you think it's G5 in the first place?

Somehow I think you don't actually own one.

No, plugs do not pop out unless your cord is extremely tight, which will produce the same result if you are trying to move your pc.

boris.jones
Jan 13, 2008, 01:27 PM
I dont care wether or not its a G5 Im just trying to describe it in a quick and uninformed way.

It is the new alumimium Imac 24" there cant be so many variations on that.

But yep the power cord is right there in the centre of the back of machine and it can pop out with a good yank and it did! And the cord IS tight I suppose because all my cables go through the large hole in the ally stand and then through a hole in my desk and then to the power supply I have rigged under the desk where my externals live.

Hey just beleive Me!

Any way this whole crazy process ( pulling [one way or another] the power supply out of the back of the imac and restarting) is similar to what is prescribed
under " resetting the SMU " by apple as suggested in the post a few above - many thanks for that because that was at least useful! pulling that plug out was an essential for fix me.


I knew it was a hardware problem because I have a bootable external backup of my system and the result was the same - and even prior to the system completing its boot _ Instant! every time!

boris.jones
Jan 13, 2008, 02:21 PM
Very strange. Maybe try resetting the SMU (http://docs.info.apple.com/article.html?artnum=301733).

You are a useful contributer - more like you! please!

mad jew
Jan 14, 2008, 02:44 AM
You are a useful contributer - more like you! please!


Thanks mate but I got it wrong. I posted a link for resetting a G5 iMac's SMU but since it's an Intel machine a SMC reset would be more apt. If it happens again, try this (http://docs.info.apple.com/article.html?artnum=303446). :)

boris.jones
Jan 14, 2008, 06:51 AM
Thanks mate but I got it wrong. I posted a link for resetting a G5 iMac's SMU but since it's an Intel machine a SMC reset would be more apt. If it happens again, try this (http://docs.info.apple.com/article.html?artnum=303446). :)



Thnx again - your link to

this (http://docs.info.apple.com/article.html?artnum=303446). :)[/QUOTE]

- is exactly the same as -pulling the power cord out of the back by accident - (best though probably when switched off and as directed by apple) !

thanks again for being so helpful!

darfel
Jan 29, 2008, 02:56 PM
Thnx again - your link to

this (http://docs.info.apple.com/article.html?artnum=303446). :)

- is exactly the same as -pulling the power cord out of the back by accident - (best though probably when switched off and as directed by apple) !

thanks again for being so helpful![/QUOTE]

I bought an iMac G5 1.8 17" on eBay with this problem...this fixed it for me!

Thank you!!

davidcsmalley
Apr 26, 2011, 09:00 AM
I finally figured it out.

I tried everything... resetting, holding in the power button, unplugging the power... all the mac forum tips... nothing worked.

I finally shut the computer down, removed the cover, and took the processors out, and put them right back in. It took less than 15 minutes. (I did have to have buy a special set of Allan Wrenches that were long and skinny to reach the bolts that hold the procs in.) It was $12.

As an added precaution, I switched the processors—meaning I put them back in on opposite sides.

So, I don't know if they just needed to be reseated, or if the arrangement matters, but either way, she purrs like a kitten now!