Upgrading to OS X Mountain Lion

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Level 1

16 points

Upgrading to OS X Mountain Lion

I have a "late 2006" Intel iMac -- guess that isn't supported by OS X Mountain Lion, which seems to demand mid-2007 or newer.

In that short span of 4-6 months, I'm not sure what changed that would not allow my Late 2006 iMac to run Mountain Lion. Can someone say what is the difference?

Not long ago I upgraded to a 1 TB hard drive and increased memory to 4 GB. I don't want to give up on my iMac -- it runs just fine.

So, guess if I can't run Mountain Lion, I'll just get along with Lion.

iMac, Mac OS X (10.7.4), Model iMac6,1 late 2006

Posted on Jul 19, 2012 1:11 PM

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Answer 1

Jul 19, 2012 1:13 PM in response to Maui Man

I don't know. Usually Apple posts specifications for the requirements for an OS upgrade, but this time they only put the years of supported machines.

So, guess if I can't run Mountain Lion, I'll just get along with Lion.

OK then. That's what you'll have to do.

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Answer 2

Kappy

Level 10

361,741 points

Jul 19, 2012 1:16 PM in response to Maui Man

Mountain Lion requires a model that has 64-bit EFI boot ROMs which early Intel models do not have, thus, they cannot boot Mountain Lion's 64-bit kernel. Unlike Lion, ML will not support older 32-bit EFI boot ROM machines. This is not something that just happened in 4-6 months. ML never supported the older models. See:

Apple - OS X Mountain Lion - Read the technical specifications.

Mac OS X- 64-bit kernel frequently asked questions

OS X- Starting up with the 32-bit or 64-bit kernel

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