I’ve had absolutely no problems with macOS Monterey, but MacRumors reports that the operating system update is “bricking” some older Macs. If you have an older Mac, you should hold off on updating for now.
MacRumors says that at least ten separate posts (1, 2, 3 4, 5, 6, 7, 8, 9, 10) on Apple Support Communities are from users complaining that as they were attempting to update their Mac to macOS Monterey, the Mac went completely black and they’re unable to turn it on. One possible solution mentioned on Apple Support Communities is that users may need to revive or restore their Mac’s firmware.
