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Why do I get the message "This disk cannot be used to start your computer" w/ upgrade to Mountain Lion from 10.6.8

654 Views 3 Replies Latest reply: Aug 22, 2012 10:08 PM by mende1 RSS
TerryNord Calculating status...
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Aug 22, 2012 8:33 PM

I have a MacBok pro later than 2007.  running 10.6.8 .  Downloaded Mountain Lion from app store.  When  I get to the install page I get the message "This disk cannot be used to start your computer."  What is the problem and what can be done?

MacBook Pro, OS X Mountain Lion
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