Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time. You may need to do this several times.
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Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time. You may need to do this several times.
See if resetting the SMC helps > How to reset the System Management Controller (SMC) on your Mac - Apple Support
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