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I have an old MacBook (2-3 years old), it is running 10.9.

Last night I cloned the hard drive and tried to use it as a startup disk on my new MacBook Pro (June 2016, with 10.11 installed).

All I got was a no entry sign on startup. How can I make it boot?

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No Mac will boot to an OS older than itself, with the exception of models released right on the cusp of a new major OS version.

The drivers for the newer model didn't yet exist.

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