HT201581: Find your Mac's serial number in About This Mac or System Information
Learn about Find your Mac's serial number in About This Mac or System Information
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Helpful answers
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Dec 10, 2012 9:27 PM in response to adry1055by BDAqua,Hi Adry,
What shows as boot choices if you hold the option or alt key at bootup?
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Dec 11, 2012 7:01 AM in response to adry1055by Neville Hillyer,Try safe boot: http://support.apple.com/kb/HT1564