Q: Not booting with thunderbolt cable connected

see https://discussions.apple.com/thread/4163641

I, too, have encountered this issue of not being able to boot my MBP when the thunderbolt cable is connected. If I connect my thunderbolt cable which is connected to 2 thunderbolt displays, of which one of them is connected to the corporate network, my MBP will not boot up. I have to disconnect the thunderbolt cable, boot and log in to the MBP, and then connect the thunderbolt cable for it to work.

I have a MacBook Pro (Retina, 15-inch, Mid 2014) running OS X El Capitan (10.11.6). This problem seemed to start soon after enabling the FileVault or installing a security update a few months ago.

MacBook Pro (Retina, 15-inch, Mid 2014), OS X El Capitan (10.11.6)

Posted on Sep 6, 2016 10:49 AM

I have this question too

Q: Not booting with thunderbolt cable connected

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by Side_Step_Society,

Side_Step_Society Sep 6, 2016 3:00 PM in response to idasali
Level 2 (368 points)

Apple Music

Sep 6, 2016 3:00 PM in response to idasali

Try an NVRAM reset:

1. Shut down your Mac.
2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
3. Turn on your Mac.
4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
6. Release the keys.
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by idasali,

idasali Sep 6, 2016 3:39 PM in response to Side_Step_Society
Level 1 (12 points)

Mac OS X

Sep 6, 2016 3:39 PM in response to Side_Step_Society

I have already tried this [multiple times] with no luck.
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Q: Not booting with thunderbolt cable connected

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by Side_Step_Society,

by idasali,

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