The fan runs loudly during startup.

When I start my Mac in the morning after I turn it off the night before, the fan made a charge to rush sound for about 30 seconds.  It is a pulse sounds similar to the waves of the ocean coming in and out.  At the same time, it freezes sometimes for a few minutes, and then it started working correctly.  After that, it works normally.  I'm looking at a catastrophe delayed?

Try resetting the SMC by iMac SMC and the PRAM reset

Tags: Mac

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