![]() ![]() Reset your Startup Disk and Sound preferences.Reset the System Management Controller (SMC).Disconnect all third-party peripherals.Shutdown the computer, wait 30 seconds, restart the computer.You should try each, one at a time, then test to see if the problem is fixed before going on to the next.īe sure to backup your files before proceeding if possible. If they claim it still works in your version of macOS then see the following:Ī Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later Unless they state otherwise it is their fault, not Apple's.
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