10.11.3 - cannot start iMac with monitor external thunderbolt

Updated 10.11.3 yesterday evening.  New problem I've ever seen.

iMac (late 2015 version, with 27 "screen Retina 5 K, Core I6, SSD, Radeon R9, 16 GB of memory).

connects via a thunderbolt cable to

Apple 27 "monitor Thunderbolt, model A1407

(so I see two screens 27 ", side by side)

System does not boot under 10.11.3.

Boot process goes through the white Apple, then the line under the Apple gets almost half way through

At that time, an arrow cursor appears on the screen of your iMac.

A second more later, arrow cursor appears on the screen external thunderbolt.

And then the system hangs.  Nothing changes.

However, if I physically pull the Thunderbolt, the iMac starts correctly.  The boot process works as it should.

In this case, * after * I connect, I can connect the thunderbolt and the external monitor works properly.

However, if the system is then reset, either by choosing the restart, or due to a failure, then the boot process hangs.

I have:

(1) used Safe Boot (shift - restart).

The two screens can be mounted properly.  A lot of horizontal scroll around (to test screens?); Subsequently, the system works correctly.

However, after starting secure, I try to restart normally with the external screen, the boot process hangs again.

(2) reset the NVRAM.  No effect.

(3) reset SMC, controller of system management (by removing power for 30 seconds).  No effect.

Suggestions?  Ideas?

Hey there buddy.

I'm with you on this one...
Exactly the same problem I am experiencing and before anyone posts macro stuff that we all read, I'm just saying I'm sure that 90% of us have already made the NVRAM reset, reset the SCM and so on...

My MacBook Pro works perfectly one day and the next day I get this * updated... external monitor no longer works with my HDMI.

I'm sure that some of the support will suggest for us to watch a few pages "Troubleshooting" and suggests that our cables are broken or our monitors surprisingly stopped working after this magic update...

Another favorite of mine suggestion is for us to go there and buy the cable HDMI $99 is made by apple...

I'm * offshore, that an update can cause so much hassle and worst of all, wasting my time by reading more than a dozen pages of dumb suggestions...

@APPLE, you will find the * bugs and solve this problem, it is simply unacceptable. An update of shit limits my use of the laptop... What's next?

Tags: Mac OS & System Software

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