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Why is my macbook pro extremely hot after Lion install

After successfully intalling Lion, my mac book pro is getting very hot.

MacBook Pro, Mac OS X (10.7), 2.8GHzIntelCore2Duo,4Gb1067MHz

Posted on Jul 20, 2011 4:35 PM

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21 replies

Jul 21, 2011 7:52 PM in response to yepuv1

My MBP late 2009 has been running hot also. Indexing was finished in about 15 min. I have 8 gig of ram. No load to 5% load on CPU results in 185 F CPU temps and 5000 RPM fan. This is with NO PROGRAMS RUNNING! I did a SMC reset, no help. I reinstalled lion, no help. When I try to do a time machine back up the temps have risen to above 200 degrees F. Not good!

Jul 22, 2011 3:02 AM in response to yepuv1

My Macbook Pro (Mid 2007) is also running fans blazing, with almost no load.

The indexing of spotlight is already done, so that's not a problem.


When I dont use the Mac the fans are almost quiet, but not like before with Snow Leopard.

As soon as i start using Safari to browse through some pages the fans start to rev up, even if there's no flash animations on the pages.


This is a pretty big issue in my opinion. There seems to be a bit of talking about it if you google it..

Jul 23, 2011 4:46 PM in response to crizyal

crizyal wrote:

No load to 5% load on CPU results in 185 F CPU temps and 5000 RPM fan.

Not unusual. Someone (not me) reported 90° C using Lion (not with the released version — some time before the golden master of 10.7 was seeded). Here I sometimes see peaks above boiling point. Don't worry about it, there should be no harm to the computer.


Please add to your profile some details of your hardware.

Jul 23, 2011 5:05 PM in response to Simtrax

Simtrax wrote:

… indexing of spotlight is already done … As soon as i start using Safari to browse through some pages the fans start to rev up, even if there's no flash animations …

Issues may be not limited to animations.


Try uninstalling Flash then whenever playback of Flash content is critical:


  1. drag the icon of the page (to the left of its address)
  2. from the toolbar of Safari
  3. to the Dock icon for Google Chrome, where the player is integral (and bugged in the ways outlined above) .


Some technical detail of what's new in Lion is alrady published:


What's New In Mac OS X: Mac OS X v10.7 Lion


For more in-depth knowledge, without paying to join a programme you can view at least some of the following:


WWDC 2011 Session Videos - Apple Developer


My uneducated guess is that some of the cooling and/or load — maybe not demonstrable by Activity Monitor — is GPU-related, something to do with tightened integration between OpenCL and Grand Central Dispatch.


Incidentally I'm currently not convinced that iStat Menus 3.18 (3.18) offers a suitably comprehensive guide to the gamut of things that Apple does with 10.7 (Build 11A511).

Why is my macbook pro extremely hot after Lion install

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