11/4/2023 0 Comments Sophos home for mac os sierraContinue holding the keys down until the computer restarts, and you hear the startup sound for the 3rd time. You must press this key combination before the gray screen appears. Press and hold the Command-Option-P-R keys. Press and release the power button to turn on the computer.Ĥ. You will need to hold these keys down simultaneously in step 4.ģ. Locate the following keys on the keyboard: Command, Option, P, and R. The computer should still be shut down.Ģ. Disconnect the power cord from the monitorġ. Time Machine problems have been preventing Mac owners from backing up their devices since upgrading to macOS Sierra, and the problem is widespread enough that Apple has released a guide on what to do if you can't back up:Ģ. MacOS Sierra problems: Time Machine won't back up Mac
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