(See also Install Snow Leopard on a 2011 Mac Mini)
Booting a new MacBook Pro (Late 2011) from a retail 10.6.3 disc resulted in a black screen and a repeating 3 beep pattern. This is due to missing Sandy Bridge drivers. Apple will ship a 10.6.6 (iMac) or 10.6.7 (MacBook Pro) installer disc* upon request which includes the necessary drivers to boot the latest models.†
As I could not wait for the disc to arrive, here is the process I followed to downgrade a new MacBook Pro (Late 2011) from Lion to Snow Leopard (see notes below for a faster method):
Here is an abbreviated version of Apple's Mac OS X versions (builds) for computers showing only the latest models:
|Latest model||Introduced||OS originally included||OS included later|
|iMac (Mid 2011)||May 2011||10.6.6||10.6.7,10.7|
|Mac Mini (Mid 2011)||Jul 2011||10.7|
|Mac Pro (Mid 2010)||Aug 2010||10.6.4||10.7|
|MacBook Pro (Late 2011)||Oct 2011||10.7.2|
|MacBook Air (Mid 2011)||Jul 2011||10.7|
See also Finding your Mac OS X version and build information.
Notes & Updates:
/mac | Nov 24, 2011
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