A month and a half ago, I installed a new SSD and everything works well. I followed all the instructions here and everything turns great. Last week, I installed an update from Apple but before doing it, I disabled the TE and re-enabled the kext. I installed the update and enabled TE again. Then I disabled kext and all works well. I did the same exact procedure when the latest Apple update came out. The problem is, the MBP was unable to boot up. I don't know what happened. I have an original installer of OS X and I'm not sure if I just reinstall it and start from there again?
Â
After Apple Update, unbootable startup drive
Try the any of the steps below:
-
Boot in safe mode and try re-installing the OS again. To safe boot your device:
-
Hold down Shift and press the power button. This can take quite a while to start up. Reboot and see if the device starts up normally again.
-
If your screen is stuck on the grey boot screen, try the steps below to get back into the OS X:
-
Boot up in recovery mode – press the CMD&R key and push the power button on
-
Open the terminal
-
Run this command: nvram boot-args If you get a message on the screen displaying kext-dev-mode=1 then go to step 5. If not:
-
Run this command: nvram boot-args=kext-dev-mode=1
-
Reboot in recovery mode again
-
Run the commands below (Replace your Disk Name with that name of your device disk and there should be no / before the system name.)
cd "/Volumes/Your Disk Name"
touch System/Library/Extensions
kextcache -u "/Volumes/Your Disk name"
-
      Wait until it has finished running (this can take up to 10 minutes) and reboot
Â
Â
