Mac runs until 6 minutes remaining then shts dow, goes back and starts again can’t open the computer
How do I get the upgrade loaded when I can’t open the computer
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Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.