To install OS X 10.8 Mountain Lion or OS X 10.10 Yosemite (currently available free upgrade) you need one of these Macs: Your Mac can run the new and free OS X Yosemite with enough RAM installed or you have the option of paying $20 to download and install OS X 10.8 Mountain Lion. Then, determine if your Mac meets ALL minimum system install requirements. This step is really needed in case something goes wrong with the install of the new OS or you simply do not like the new OS, you have a very easy way/procedure to return your Mac to its former working state.
Then, use either OS X Time Machine app to backup your entire system to the external drive OR purchase, install and use a data cloning app, like CarbonCop圜loner or SuperDuper, to make an exact and bootable copy (clone) of your entire Mac's internal hard drive. Macs are picky about RAM and RAM from local sources will NOT work in a Mac.īefore embarking on a major OS upgrade, it would be wise, advisable and very prudent if you have a good,working backup of your current system to an external connected and Mac formatted Flash drive OR externally connected USB, Thunderbolt or FireWire 800, Mac formatted hard drive.
Newer versions of OS X need all the RAM they can get.Ĭorrect, compatible and reliable Mac RAM can ONLY be purchased from online RAM sources Crucial memory or OWC ( ).ĭO NOT PURCHASE RAM FROM LOCAL COMPUTER OR ELECTRONICS STORES! At, least 4 GBs of RAM and I strongly recommend you max your 2009 iMac's RAM to 8 GBs.
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