What you need to know
- A number of people are reporting that installing macOS Monterey is causing their Macs to refuse to start.
- Impacted machines include both portable and desktop Macs.
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macOS 12 Monterey is bricking some older Macs, so you may want to hold off on the update
Apple released macOS 12 Monterey to the public early last week. This major version was first revealed during the opening keynote of WWDC21, back in June. It had been in beta testing since then to ensure a smooth experience for the public. Ironically, it seems like the stable build has been bricking some users’ older Macs, based on online complaints.
Maybe I’m glad I’m running Catalina with Fusion Drive on my iMac. From what I hear Apple is having problems with Mac’s running Fusion Drive running macOS Big Sur and macOS Monterey.
“Come on man” let’s get it together Apple! 
Why macOS updates might brick your Mac, and what you can do about it
Anecdotal reports from over the weekend indicate that the macOS Monterey update may be bricking some Macs during installation, leaving the machines unresponsive. MacRumors has rounded up a representative swath of complaints from the Apple Support Communities forums and Twitter, mostly describing the same symptoms: unresponsive Macs that can't be revived using the typical SMC and NVRAM diagnostic catch-alls.
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