1 Reply Latest reply: Nov 19, 2012 12:02 PM by Grant Bennet-Alder
jfritchman Level 1 (0 points)

I went to the Apple Store and tried to purchase OS X Mountain Lion and when I click Buy App I get a message "OS X Mountain Lion is not compatible with this computer."  There is no other explanation or information.


Anyone else have this or does anyone know why?



Mac Pro, Mac OS X (10.7.5)
  • Grant Bennet-Alder Level 9 (56,679 points)

    Mac Pro models before the 2008 models have an EFI-32 firmware version so old, Apple has decided not to update it to EFI-64. (there may not be enough space in the control store to update it easily.)


    The newer Mac OS X 10.8 version also requires a newer graphics card and MUCH more RAM memory, which is frighteningly expensive on these older models.


    If you need a major RAM upgrade, you could sell your old Mac and buy a 2009 or later model, add more RAM, and still come out ahead.