I know it's only a temporary fix untill Apple comes up with a permanent one, but it might help you out if you really need to have your machine back up and running for the time being.It is a bug, this is a partial workaround. Manually reloading the Kernel extensions for WiFI/Bluetooth have not helped, maybe another terminal wizz can help with this step?Īnyway, I hope I helped you get up and running again, be it with some bumps in the road.

Mind you, this fix will cause your WiFi/bluetooth to not work. Close the machine back up and do NOT restart or shut down your machine.Reconnect the IO-cable with the machine running.Start the MacBook as you normally would and it should boot now.Disconnect the IO-cable that runs from the morherboard to the IO-board on the left side of the machine (when upside down), it's the connectors that have the little metallic shields on them that are held down by T5 screws).I have a machine here that has the exact same problem, gives me a black screen and nothig works after updating to Big Sur.Īfter some reversed engineering I found a temporary fix to get the machine working again:

Genius Bar Reservations are hard to obtain during covid times. Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the InternetĪll of that lead to nothing.Resetting SMC with Shift, Control, andOption (Alt) on the left side of your keyboard.You can release the keys after about 20 seconds, during which your Mac might appear to restart. Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R.I have since also tried all of the following: Then tried restareing but got nothing but the black screen, no apple logo. Then I closed the screen but the black light was still illuminating the apple on the back of my 2014 13' MBP. I downloaded Big Sur right when it came out a couple of nights ago it already had problems downloading and I should have waited longer but was so excited i finally managed to get it to download the next morning and then it asked it restarted for the install but never turned back on and was stuck on a dim dark black screen, plugged in, for hours.

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