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Every iMac from the mid-2007 release onwards can run Yosemite, and the last model that couldn't could also only address 3GB of RAM. So it's almost certain that your iMac will be able to run Yosemite.


I just experienced the same issue for the past week on a mid-2012 quad-core MBPr w/ 16 GB ram. Turns out it was caused by a program called Memory Monitor. After disabling this program the issue stopped and I get smooth video playback. Update: After more observation it appears to be a memory issue. If I spin up a Parallels VM the stutter comes back, but ...


I went under details after you hit software update and removed everything that is checked in boxes except the system update. That worked for me since I only wanted system update not iTunes and etc.


If you reinstalled without erasing the disk, you might have something incompatible from your previous system. Try to restart holding the SHIFT key. This brings you into safe mode, where only apple components are loaded. The system might react slow, but should let you apply the update. (Would also prefer the combo update, as mentioned by 'forquare'.)


Follow the instructions here on creating a bootable USB from a Windows ISO file: http://www.reddit.com/r/mac/comments/2fy3be/by_popular_demand_my_better_than_bootcamp_guide/ Unfortunately, I'm having difficulty finding the original tutorial I used to install Windows 8.1 on a partition on my Mid 2009 MacBook Pro, but here is a similar write-up: ...


Normally "private" is about 2-2.5GB, it contains "private" information for the OSX. You should not mess around in it. It also contains the "sleepimage" file which is the largest file of all in this folder. BTW: 10.5... is Leopard, 10.6 is SnowLeopard, I assume a typo.


All the files and folders within private are needed to run the Operating System and it exists in every version of OS X. The folder private has lost its hidden attribute.

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