Sierra Update has Broken my MacBook Pro Retina 2013 Computer
Anybody else having the same problems?
MacBook Pro with Retina display, macOS Sierra (10.12)
Some users experience glitches with updates. Sounds like you were one of them.
Without knowing how it is "broken" all I can suggest:
- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
https://support.apple.com/en-us/HT201262
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
https://support.apple.com/en-us/HT201314
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
https://support.apple.com/en-us/HT204904
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
Then format the startup disk and do a fresh install of OSX
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum or other appropriate forum.