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my computer shows the grey screen that says i need to restart when i tray and boot from an external hard drive

It shows the grey screen that i need to restart when i try to boot from an external hard drive. both drives have snow leopard

MacBook Pro, Mac OS X (10.6.8)

Posted on Feb 10, 2013 1:45 PM

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my computer shows the grey screen that says i need to restart when i tray and boot from an external hard drive

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