10.9.3 kills third monitor

I received a call from support yesterday asking me to install the update twice. I guess some have had that resolve the issue. I did test early this morning and did not resolve the issue for me. Waiting on support again. I can validate that this issue was reported during the beta and a case was opened but never resolved.

i also installed the combo update today and it did not resolve the problem! also tried VRAM and PRAM (whatever) reset.... does not help - in fact, after pram reset, the MAC hangs while booting! had to cut it from the power line for a fews seconds to make it boot normaly again (with only 2 monitors of course).

APPLE PLEASE FIX THIS SOON!!!!

I have done everything suggested so far: reinstall, NVAM and PRAM reset, kext "fix" and nothing has fixed the problem.

hello all -

i have a new mac pro, a thunderbolt display, and an older, 6+ year older, apple display. i downloaded and installed OS10.9.3 last friday and immediately, the older display would not work. additionally, one of my pegasus raid enclosures did not show up in the finder( this had also occurred in 10.9.2 periodically.

i tried to make it work several times with negative results and then i called apple tech support. he talked to me for awhile, tried several things which didn't work and turned me over to his supervisor. i talked to the supervisor for over 2 hours, he tried several thiings and it still didn't work. he thought maybe the 2nd display was too old to be recognized by 10.9.3 and sent a program which downloaded info on the old display to him and he then sent it to apple engineers for analysis. as far as i know they still haven't finished their analysis.

meanwhile, i have tried several things over the weekend:

i put the system to sleep using the apple menu and left it overnight. it still didn't work. i then shut down the system overnight and tried it again in the next morning. the next morning, i started the system and it worked - both items. a miracle.

i then reverted to using sleep, and tried it. it worked again. i left it on, it slept overnight, and when i started it next am, it still worked. it appears that the new system is capable of learning and solving its own problems.

so my message is, keep trying and maybe your issues can be resolved.

good luck all:

bob

Yeah, I went through the same rigmarole with Apple support on the phone yesterday. Halfway through installing the combo update, I asked the rep, "just level with me, is this a complete waste of my time, because this seems like a pretty halfhearted effort to fix this problem and i've already reset the pram/smc?" he didn't quite say yes, and he didn't quite say no. so it sounds like we're all waiting on the apple engineering team to decide this is enough of a problem to issue a real patch.

...in the meantime, i have two 24 inch monitors hanging lifeless over my head like a pair of dead limbs...

Yes, that's the question, how rigorous can the beta testing possibly be on MacPro systems for them not to discover bugs like this before they roll out updates to customers. Selling people on half baked operating systems is something you would expect from Microsoft.

Same problem here..."after installing 10.9.3, only 2 of 3 monitors working on mac pro (2013)!"

Yep. Same here.

Mac Pro 2013 with 2 30" Cinema HD Dsiplays and 1 21" Cinema Display.

When all three are connected, one 30" stays black.

It works with 10.9.2. Also when booted from Recovery Disk, all three work.

So this is no hardware issue.

I tried NVRAM and SMC reset but to no avail...

The problem with beta testing is, that no one installs the beta version on their productive high end system....

Try this:

Do not use sleep. Shut down the system using the apple menu, not with the power button on the computer. Let it sit for awhile. Reboot.

It worked for me.

Good luck.

Bob

I also saw this as I was trying to solve problem. This has been reported to apple engineers also, but I fear they are not too concerned. When I told the " senior advisor" this topic was up and man folks had the same problem he asked me for the URL so he could look at it. Perhaps the beta testers don't all use three monitors.

This did nto work for me. It reid it twice as I have all the other ideas and none work. I think what will really work is for Apple to acknowledge anf fix the bug they made in 10.9.3. If that doesn't happen soon then my next step will be to lug my Mac Pro Trash Can to the local Apple genius bar to see if the can put it back to 10.9.2

FYI, I just heard back on my bug submission to Apple:(of course I can't seem to access the bug they left open so have no way of seeing what if anything they are doing about it)

Engineering has determined that your bug report (16953492) is a duplicate of another issue (16796953) and will be closed.

The open or closed status of the original bug report your issue was duplicated to appears in the yellow "Duplicate of XXXXXXXX" section of the bug reporter user interface. This section appears near the top of the right column's bug detail view just under the bug number, title, state, product and rank.

An example of the duplicate section from the bug reporter user interface with your bug and the duplicate bug info is included below:

16953492 10.9.3 killed multiple monitor support

State: Closed Product:

Rank: No Value

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Duplicate of 16796953 (Open/Closed)

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i also reported this bug and got the exact same message today.