iMac Suddenly the internal fan is very loud

mookiedog · mookiedog #1 (**permalink**)

05-26-2011, 10:16 AM

We did have a lightning storm last night. Prior to that I unplugged the computer and there were no lightning strikes nearby. This morning the internal fan is much louder, pretty obnoxious in fact.
Nothing else seems wrong.

Any ideas? This is a relatively new iMac 27inch so I might lug it up to the apple store.

Mookiedog

Buzzard2010 · Buzzard2010 #2 (**permalink**)

05-26-2011, 10:32 AM

Welcome to Mac-Forums mookiedog
Have you tried restarting the iMac since the problem occurred? Also does the fan keep spinning fast and loud or does it slow after a while?

Also if you could post your mac specs (year/model) and OS version (at a guess 10.6 but you never know

)

Cheers

- Simon

mookiedog · mookiedog #3 (**permalink**)

05-26-2011, 10:35 AM

I unplugged the computer, waited and replugged it back in.

All is well. I think i will call applecare to find out what happened though.
Who knows.

Buzzard2010 · Buzzard2010 #4 (**permalink**)

05-26-2011, 10:40 AM

Glad it is sorted now though!

- Simon

MancmacUK · MancmacUK #5 (**permalink**)

05-26-2011, 11:44 AM

Install a fan speed monitoring app, there's one that sits on the top menu bar, iStat menus gives you all three fans (3 on my iMac)!
or widget iStat, you should see the speed increase when the noise increases.
Plus lots of other info.

v1.3
http://www.brothersoft.com/istat-menus-275403.html
or v 2.0
http://mac.brothersoft.com/istat-men...-download.html

Usually the fan(s) speed up when the iMac needs a bit of extra cooling, quite scary the first time you hear it.

Normal speed is around 1,000 rpm for all fans.

When you unplugged and waited, the iMac cooled down.

Buzzard2010 #2 (permalink)
Member Since: Oct 22, 2010 Location: Bakewell, UK Posts: 2,534 Mac Specs: iMac G3 800MHz :D \| PowerMac G4 \| MacBook Pro 15" 2.8GHz C2D 500GB HDD 4GB 9600M / 9600M GT 10.7.1	05-26-2011, 10:32 AM Welcome to Mac-Forums mookiedog Have you tried restarting the iMac since the problem occurred? Also does the fan keep spinning fast and loud or does it slow after a while? Also if you could post your mac specs (year/model) and OS version (at a guess 10.6 but you never know ) Cheers - Simon Rest In Peace Steven Paul Jobs February 24, 1955 - October 5, 2011 [aged 56] If you have been helped, don't forget to use the Reputation system just above the post to the right. May 2011 Nominated: March 2011 & April 2011
	QUOTE Thanks

Buzzard2010 #4 (permalink)
Member Since: Oct 22, 2010 Location: Bakewell, UK Posts: 2,534 Mac Specs: iMac G3 800MHz :D \| PowerMac G4 \| MacBook Pro 15" 2.8GHz C2D 500GB HDD 4GB 9600M / 9600M GT 10.7.1	05-26-2011, 10:40 AM Glad it is sorted now though! - Simon Rest In Peace Steven Paul Jobs February 24, 1955 - October 5, 2011 [aged 56] If you have been helped, don't forget to use the Reputation system just above the post to the right. May 2011 Nominated: March 2011 & April 2011
	QUOTE Thanks

MancmacUK #5 (permalink)
Member Since: May 05, 2011 Posts: 72	05-26-2011, 11:44 AM Install a fan speed monitoring app, there's one that sits on the top menu bar, iStat menus gives you all three fans (3 on my iMac)! or widget iStat, you should see the speed increase when the noise increases. Plus lots of other info. v1.3 http://www.brothersoft.com/istat-menus-275403.html or v 2.0 http://mac.brothersoft.com/istat-men...-download.html Usually the fan(s) speed up when the iMac needs a bit of extra cooling, quite scary the first time you hear it. Normal speed is around 1,000 rpm for all fans. When you unplugged and waited, the iMac cooled down.  iMac 21.5" 2.5 GHz Intel Core i5 OSX 10.8.3 Last edited by MancmacUK; 05-26-2011 at 01:02 PM.
	QUOTE Thanks

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iMac Suddenly the internal fan is very loud

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mookiedog #1 (permalink)
Member Since: May 26, 2011 Posts: 2	05-26-2011, 10:16 AM We did have a lightning storm last night. Prior to that I unplugged the computer and there were no lightning strikes nearby. This morning the internal fan is much louder, pretty obnoxious in fact. Nothing else seems wrong. Any ideas? This is a relatively new iMac 27inch so I might lug it up to the apple store. Mookiedog
	QUOTE Thanks

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