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Can't Boot From Mountain Lion Startup Drive on MBP with Mavericks Installed

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Sofi MarshallCan't Boot From Mountain Lion Startup Drive on MBP with Mavericks Installed
by on Sep 2, 2014 at 4:34:26 pm

Hi everyone,

I'm trying to boot up my late 2013 15" MBP using an external startup disk running Mountain Lion. I really need to use the FCP iChat Theater feature, as I need to do some long distance editing. The startup disk works just fine, I checked it on another computer, but when I restart my Mavericks mac and choose it as the boot drive, I just get a grey screen with the universal "no"symbol (circle with a slash through it).

Any ideas on how to get around this issue?

Thanks!


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Tyler ChittickRe: Can't Boot From Mountain Lion Startup Drive on MBP with Mavericks Installed
by on Sep 6, 2014 at 12:05:34 am

How is the drive formatted? Can you take a screenshot of your disk utility with that drive plugged in to a computer where it works?

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Tyler Chittick
Integration & Warehouse Manager
Technical Support
Maxx Digital
http://www.maxxdigital.com
tyler@maxxdigital.com
714-374-4944


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Gareth RandallRe: Can't Boot From Mountain Lion Startup Drive on MBP with Mavericks Installed
by on Oct 28, 2014 at 8:38:05 am

Which version of OSX was pre-installed on your MBP when you bought it? If it was Mavericks you may be out of luck. Apple specifically warns against trying to install or boot from an earlier version of the OS than the computer came with.

See support article here: http://support.apple.com/kb/ht2186



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