HT202731: Using Apple Diagnostics
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Q: MacBook Pro (15" late 2011 OX Yeosmity with latest update) my MacBook restarted on its own with a blank grey screen manually shut ... MacBook Pro (15" late 2011 OX Yeosmity with latest update) my MacBook restarted on its own with a blank grey screen manually shut down and then turned back and logged in start up was about 50% then halt more
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Helpful answers
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Aug 4, 2015 10:57 AM in response to Coulter1963by OGELTHORPE,Boot into the recovery partition:
https://support.apple.com/en-us/HT201314
From the 4 option menu select Disk Utility.
Run Disk Utility>First Aid, Verify and Repair.
If the disk cannot be repaired, it will have to be replaced.
Ciao.