New iMac loud fan noise
Posted 15 October 2007 - 11:10 AM
I am running the hardware test now, unplugged every thing except the keyboard and mouse and restarted with "D" key pressed down.
Posted 15 October 2007 - 06:18 PM
mouse then the power cord was unplugged from the back of the iMac.
What is interesting to me, when the iMac is shut down every evening a power strip is turned off that cuts off power to iMac, printers and external hard drives. So there is no power available every night? But unpluging the cord from the back of the iMac worked??
Posted 16 October 2007 - 08:27 AM
From the back of the horizontal vent,i can feel air gushing out ! I tried to off it and restart...no use.
Here's what i did to "solve" . I shut down and went for my dinner.
Half an hour later, I switch the Mac on and the fan noise disappered !
Since then, touch wood...it is okay.
I did nothing different....Strange !!
Hope this help if anyone else encounter this problem.
Switch off and take a break ....an restart...before you drag the whole iMac to service centre.
Posted 09 January 2008 - 06:08 PM
And the problem is: when I use BootCamp and the fans are crazy, Windows don't start. MacOS X runs OK (if you can ignore the noise and the "tornado" on the back of monitor..). Go figure....
Anyone has the same Windows problem??? It only crashes at startup when the fans are like that, so i guess it's no a software problem.
Posted 09 January 2008 - 07:40 PM
This should help you understand a bit more. It's also the same process for the Intel based Mac mini, iMac G5s, and Power Mac G5 ( Late 2004 ). Once I started reading your post I realized what Apple was suggesting and why, and remembered that was the new way of a PMU like reset and that's what I had to do to my iMac G5 ( iSight ) once.
Posted 11 February 2009 - 01:26 PM
This is the second time it happens in one week. I have installed Windows XP by using BootCamp.
Windows did not start or took very long time to boot, could not wait. I tested the hardware by holding down the "D" button and no fault where found. Mac OS worked.
After several restarts with power loss it suddenly worked...
Does any one know if there are a software fix for this?
Posted 02 April 2009 - 04:08 PM
It's still fairly quiet. It just runs constantly at 1200 rpms (cpu and hd fan) and 700 rpms (optical fan,) and is loud compared to my old 20" aluminum iMac 2k7 refurb which was dead silent with no fan noise at all.
After some internet searching it looks like some say their 24" iMacs are dead silent while others say there is a slight fan noise to theirs.
Apple had me power it off, unplug and hold down the power button for 20 seconds, but that didn't do anything. Apple tech support said the fans shouldn't kick in at all upon bootup if the iMac has been off for a few hours. But the fan always seems on.
A friend says he puts his ear up to his 24" alu iMac and hears nothing.
What say the MacWorld 24" alu iMac owners?
Posted 10 April 2009 - 03:55 AM
The noise is just nothing compared to my old emac, which produced an unwanted white noise background throughout my working day.
Posted 11 April 2009 - 09:43 PM
Then, I have decided to run Apple Hardware Test from the internal hard drive by restarting my computer while pressing and holding the 'D' key on the keyboard during startup. (http://support.apple.com/kb/HT1883). This process was completed in a few minutes and once I have restarted my iMac, very annoying rattling noise was GONE!