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I updated macOS Sierra and now my computer is r...

After updating to the latest software at first I couldn't see the screen at all after I logged in,  now after logging in safe mode and then restarting the computer it has loaded very slowly and I can't seem to access Mission Control. How can I undo the latest installation of software upgrade. Please 

Erase the disk drive and then reinstall the backup made immediately prior to the upgrade.



Thank you



最后更新:2017-08-23 05:30:41

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