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Level 1

15 points

Black screen after Macbook Pro update to Big Sur

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..

Then I closed the screen but the black light was still illuminating the apple on the back of my 2014 13' MBP. I opened it back up andpowered it down. Then tried restareing but got nothing but the black screen, no apple logo.. I have since also tried all of the following:

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.
Resetting SMC with Shift , Control , andOption (Alt) on the left side of your keyboard
Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet

All of that lead to nothing. Genius Bar Reservations are hard to obtain during covid times. Please help!

Thanks :)

[Re-Titled by Moderator]

MacBook Pro 13″, macOS 10.15

Posted on Nov 14, 2020 11:31 AM

Best reply

Morridinges

Level 1

5 points

Posted on Nov 17, 2020 1:41 AM

I have a machine here that has the exact same problem, gives me a black screen and nothig works after updating to Big Sur.

After some reversed engineering I found a temporary fix to get the machine working again:

Open the MacBook up
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)
Start the MacBook as you normally would and it should boot now
Reconnect the IO-cable with the machine running
Close the machine back up and do NOT restart or shut down your machine
Happy computing

Mind you, this fix will cause your WiFi/bluetooth to not work. Manually reloading the Kernel extensions for WiFI/Bluetooth have not helped, maybe another terminal wizz can help with this step?

Anyway, I hope I helped you get up and running again, be it with some bumps in the road...

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.

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Black screen after Macbook Pro update to Big Sur

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