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Helpful answers
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Jan 30, 2016 9:07 AM in response to mikee89by Kappy,Try this:
Intel-based Macs: Resetting the System Management Controller (SMC)
Resetting your Mac's PRAM and NVRAM
Repair the Hard Drive and Permissions - El Capitan
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears.
Repair
When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the indented Macintosh HD entry from the the left side list. Click on the First Aid tab in the toolbar.. If Disk Utility reports any errors that have been fixed, then re-run First Aid until no errors are reported. Wait until the operation completes, then quit Disk Utility and return to the main menu. Select Restart from the Apple menu.
Now, Download and Reinstall OS X El Capitan 10.11.3 Combo Update.
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Jan 30, 2016 9:09 AM in response to mikee89by Kappy,Is this a separate question from the topic? Read the Apple Support Communities - Terms of Use to find out how to formulated a proper question.
Find your Mac's serial number in About This Mac or System Information
How to find the serial number of your Apple hardware product
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Jan 30, 2016 9:19 AM in response to mikee89by dominic23,Please take the computer to the Apple store to have the serial number restored.
https://discussions.apple.com/thread/7267875?start=0&tstart=0
Best.
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Jan 30, 2016 9:57 AM in response to Kappyby mikee89,Downloading the Combo update! Cross finger it works out.
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Jan 30, 2016 7:36 PM in response to mikee89by mikee89,Sign in issue with Facetime and Apple Store Purchase still persists after updating the suggested combo. Any other source of support please?
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Jan 31, 2016 4:06 AM in response to mikee89by mikee89,Sign in issue with Facetime and Apple Store Purchase still persists after updating the suggested combo. Any other source of support please?