New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

Start a Discussion

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

MacBook Fan Starting and Stopping constantly

Post Reply New Thread Subscribe

Thread Tools

Member Since: Jul 17, 2011
Posts: 1
biggspj is on a distinguished road

biggspj is offline
Hi, My daughter has a macbook that has had 3 fan replaced within a month. The fan will cycle on and off constantly. It only stays on for about a second then off then back on... Its an ongoing process.
Each time I bring it into the GeniusBar they hook it up and run diagnostics on it. They always find that the fan is bad. They replace it (taking a week each time). I come pick it up, bring it home and the fan does the same exact thing. What is wrong with it?
When I picked it up in the store I stood there and let it run for 10 minutes. The fan was fine...I bring it home and now its freaking out again.
QUOTE Thanks

BrianLachoreVPI's Avatar
Member Since: Feb 24, 2011
Location: Maryland
Posts: 3,733
BrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant futureBrianLachoreVPI has a brilliant future
Mac Specs: March 2011 15" MBP 2.3GHz i7 Quad Core 8GB Ram | Mid 2011 27" iMac 3.4 GHz i7 16 GB RAM 2 TB HDD

BrianLachoreVPI is offline
I'd have to assume they did an SMC reset there - but you could give that a try. Link
QUOTE Thanks

Member Since: Jul 26, 2012
Posts: 1
Capita is on a distinguished road

Capita is offline
I am having the same problem. Been pulling my hair out about this for weeks now. The fan starts revving at high RPM's randomly on and off for like 3 sec intervals. Sometimes 10-15 secs. Im doing nothing or next to nothing when this happens. Activity monitor says i'm only using like 9% or less of my CPU.

I've had my logic and fan replaced. I've formatted my hd and reinstalled SL. I've reset the pram and the SMC dozens of times. Also checked to see that there is nothing blocking the fan. I took out my battery for a while to see if that had anything to do with it. Didn't think it would but i bought a 3rd party one recently and it works great but its a generic copy. Taking it out didnt seem to help.

Problem went away for a few days after format and install but then comes back which made me think its possibly software, maybe 10.6.8 updater doesn't like one of my 3rd party apps or something like that.

Even more confusing because it happens when i am booted to the install disk so it sounds like hardware, but that seems unlikely because i've changed the fan itself and the logic board.

I'm completely stumped.
QUOTE Thanks

Post Reply New Thread Subscribe

« DVD drive broken? | How long should the Lion OS download take? »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread Starter
Last Post
Stopping programs from starting at startup and running in the background??? mynameis Switcher Hangout 7 04-22-2005 05:38 PM

All times are GMT -4. The time now is 09:32 PM.

Powered by vBulletin
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.

Welcome to

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!

(4 digit year)

Already a member?