If you own a late 2013 or mid-2014 MacBook Pro and attempt to upgrade to the latest Mac OS “Big Sur”, you will more than likely join the growing number of users reporting Mac’s that come up with a blank screen and become completely unusable.
It is uncertain if it is just these particular generations of Macs that are affected or if the issue is more widespread.
Affected users are reporting “bricked” (completely unusable) systems after doing the update.
Apple support are unable to assist via the phone and requesting users to take their units into an Apple Repair Centre to attempt recovery.
“Users are reporting that during the course of updating to macOS Big Sur, their machines are stuck displaying a black screen. Key reset combinations, including NVRAM, SMC, safe mode, and internet recovery, are all reportedly inaccessible after attempting to install the update, leaving no way to bypass the static black screen”
If you are considering upgrading, it may be a good idea to wait till Apple sort out the bugs.