We wrote last week that the macOS Big Sur update broke some Late 2013 and Mid 2014 MacBook Pro models. Apple has already acknowledged the problem and told what to do in the event of a breakdown.
- Press and hold the power button on your Mac for at least 10 seconds, then release. If your Mac is on, it will shut down.
- Disconnect all external devices from your Mac, including monitors and USB accessories. Also remove any cards in the SDXC card slot. Then turn on your Mac.
- If the problem persists, reset the SMC as described for notebook computers with non-removable batteries.
- If problem persists, reset NVRAM or PRAM
If all of the above points do not help, the manufacturer advises to contact the company’s service center. Apple also plans to update the manual as soon as new information becomes available.