Currently Being ModeratedSep 13, 2012 12:14 AM (in response to chief2006)
I installed Mountain Lion over Lion this weekend. What a mistake!
I upgraded to Lion this past May because I was loosing my Mobile Me account. It was a trouble-free upgrade for me. During the months I was running Lion, I uninstalled software that wouldn't work under the new operating system and upgraded 3rd party programs.
I liked some of Mountain Lion's new features, but over the next few days, noticed I was getting hangs. The software that seemed most problematic was Apple software -- Mail, iPhoto, Safari. Then today I noticed the machine was unbelievable HOT. Heat was even radiating from the screen.
I've never had an issue with an Apple upgrade and I've been upgrading macs for 20 years. I kept my USB stick with the Lion installer and decided to wipe the drive and start all over with Lion. I've been spending the day getting my iMac back to it's previous state and won't be messing with Mountain Lion for a long time. I just hope the extreme heat didn't fry anything inside!
Currently Being ModeratedSep 16, 2012 9:11 PM (in response to Linda Elkind)
Linda, I with you 110%. I hope you were succcesful in downgrading. I tried to do so, but for some reason, the applications that were completely rewritten by mountain lion such as the address book iphoto and ical did not downgrade and created a major problem so I had to go back to this other cat that is so not ready for prime time
Currently Being ModeratedSep 20, 2012 9:47 PM (in response to chief2006)
Well another mountain lion update gets released and once again the overheating issues as well continuous spinning ball issue doesn't get addressed. But today after only a few hours of ios6 bring out and people complaining about the disaster that the new maps app is, and we are being told apple is locking down its developers team to fix it. When are they going to address mountain lion?
Currently Being ModeratedOct 3, 2012 9:00 PM (in response to Cichlid)
Surprisingly enough, it worked for me. (mid-2009 macbook pro)
Currently Being ModeratedOct 8, 2012 1:20 PM (in response to chief2006)
I have a 2009 27" Imac, 2.66 i5 with 16GB ram. The same thing is happening to me.
i'm not running heavy loads, but the temperature across the top of my iMac is too high.
I'm running 10.8.2 and it's only happened after the upgrade.
my wife came in and rested her hand on it and reacted as if burnt. it CANNOT be normal.
what can i use to check internal temperature - any tips?
Currently Being ModeratedOct 8, 2012 1:28 PM (in response to kingantman)
iStatpro is what I have used for several years, available here:
Hope this helps.
Currently Being ModeratedJun 2, 2013 8:35 AM (in response to chief2006)
I installed Mountain Lion a few days ago, and had no idea firstly that it would prevent me from using my existing version of photoshop...this has caused me no end of problems as I was in the middle of retouching a job (Im a photographer, and a skint one, so dont have the ready funds to buy the latest version).
Now my imac reaches very high temperatures, so hot that its too hot to touch, and theres a smell of burning components. I have telephoned Apple, but got nowhere, no answer really regarding this issue.
My imac is only a couple of years old, and I no longer have apple support, but obviously many of us are experiencing this same issue.....which means its something Apple should be taking into consideration.
If my imac dies I am going to be up **** creek without a paddle, I have a new macbook pro, but the screen isnt big enough for me to work effectively when retouching.
Come on Apple....sort this out please!
Has anyone here resolved this issue.....I think Lion stops the fans from working, resulting in the high temperatures!
Currently Being ModeratedJun 2, 2013 11:55 AM (in response to TsiaUK)
I downgraded back to lion after this happened to me, and that solved my heat issues as well as the bizarre behavior of my 27" iMac. I had a few issues downgrading Mail,but my backups were good and I managed to get everything back to where I was before the Mountain Lion upgrade.
About a month after this happened, I got a notice from Apple that my iMac had been added to the Seagate hard drive recall. Even though my iMac was running fine, I had the drive replaced.
I recently upgraded this replacement hard drive to Mountain Lion and have had no issues. I wonder if my earlier upgrade issues were related to the health of my previous hard drive.
Currently Being ModeratedJun 15, 2013 9:05 AM (in response to chief2006)
Hi I have had the same problem. I also need to change the hard disk and was recommended upgrading to Mountain Lion before I did this, so the backup will restore without problem.
Very hot Imac very bright new screen also very hot. Shut down everything I could find. Then I reduced the brightness of the screen which for some reason had become set at the brightest setting. Reduced it to the lowest possible setting. Keys F1 & F2 on my Imac.
Turned the computer off and allowed it to cool down.
Started it again at a cool time of the day and left it running with the screen on the lowest possible setting.
It has settled down. slowly increase brightness to have a balance between heat and visibility. Back to normal operating temperatures!
Hope this works for other people.