iMac 27 "with the second monitor boots black with cursor

I can't seem to find another discussion altogether as my problem starting special 'black screen ':

New iMac 27 "retina 5K (end of 2015) running OS X El Capitan 10.11.3 with second monitor Samsung connected by Mini DP - DVI.  When starting, the two screens are displayed in black, but the cursor is available and can be moved.

I have to make a hard stop and disconnect the second monitor to start at the login screen. Then I can reconnect the monitor and everything works.

Any suggestions for a fix?

So, I spent some time with Apple customer support. Several of the standard troubleshooting for problems of mystery, they came to the conclusion that there was an incompatibility of driver with the Samsung monitor at startup which is mucking things up, and I just have to accept starting with the second disconnected monitor then plug it in again after a successful login.

Samsung does not write the monitor for Mac drivers (for some reason any), that's why the customer support figures that there is a hangup at startup. But why OS X recognize the monitor and run fine otherwise? Why only hang at boot time? And why my Mac Book Pro 2007 running the same version of El Capitan boot fine with the connected monitor? It has something to do with the Thunderbolt/mini-DP-to-DVI connection? I don't know, and I guess that Apple's Support is not either.

I fell on a hack, which is as follows:

1. start with the second monitor connected

2. in the "black screen with cursor" hold the power button quite long to put the computer to sleep

3 wake up the computer with the keyboard or trackpad or other

4 and now the login screen will appear.

5 log in as usual.

6.

I hope this helps someone. One day I'll get a more compatible monitor and it will not be a Samsung.

They make nice dish, however.

Tags: Mac

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