When your Mac starts acting up, you’ll probably run through some common troubleshooting procedures, such as restarting it, running Disk Utility, and perhaps performing a Safe Boot. Your repair repertoire should also include a couple of additional procedures that can occasionally eliminate otherwise inscrutable problems—zapping the NVRAM and resetting the SMC. The procedures here apply to Intel-based Macs. M-Series Macs don’t have a procedure for zapping the NVRAM, and they don’t have an SMC. For M1-Series Macs, try shutting
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