HT201365: Find My iPhone Activation Lock
Learn about Find My iPhone Activation Lock
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Helpful answers
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Jan 13, 2015 10:54 AM in response to daarducby jason269,Hello, daarduc.
Thank you for visiting Apple Support Communities.
I see that your mac displays a prohibitory sign on startup. Here is a troubleshooting article that I would recommend going through when experiencing this.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Cheers,
Jason H.

