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...how to boot up from the external drive.With your drive plugged in and mounted, restart your MBP with the option key depressed, and you'll be presented with your boot options. (If your HD has the same name on both your boot drive and your clone, the left-most appropriately named icon is most likely to be your boot drive.)
Edit: Depress the option key immediately after you hear the chime.
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"I like notifications"Huh?