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macOS crashing and restarting

My macOS High Sierra 10.13.6. (21.5-inch, Mid 2011) keeps crashing and restarting, Can someone help?

iMac 21.5″, macOS 10.13

Posted on Apr 15, 2022 10:12 AM

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Question marked as Top-ranking reply

Posted on Apr 15, 2022 11:08 AM

How long before it crashes?


Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.


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.

3 replies
Question marked as Top-ranking reply

Apr 15, 2022 11:08 AM in response to jongislason

How long before it crashes?


Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.


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.

macOS crashing and restarting

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