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Q: LG 34um95 Ultrawide Monitor Not Waking During Boot on 2013 MP

I have a new LG 34um95 ultra-wide monitor that is Mac Pro comparable and has thunderbolt ports.  When try to boot on my 2013 Mac Pro using bootcamp and switch between OSX and Windows 8, the monitor is black (both HDMI and on thunderbolt) as if the monitor is not recognized.  If I hook up a DVI to MiniDV port to an old school monitor I get a display on that just fine.  Anytime I load OSX, the LG monitor is black until the login page - I cannot see the white screen with the apple  logo ever except for the old DVI monitor.

 

I also get random flashes and stutters on the picture of the LG monitor?

 

I don't know if it's the monitor or the Mac Pro?  Already called apple care and they told me to reset the VRam.  That did nothing.

 

Any Help?

Mac Pro (Late 2013), OS X Mavericks (10.9.4), LG 34um95-p

Posted on Sep 9, 2014 9:25 PM

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Q: LG 34um95 Ultrawide Monitor Not Waking During Boot on 2013 MP

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  • by The_Dark_Passenger,

    The_Dark_Passenger The_Dark_Passenger Oct 17, 2014 9:58 PM in response to Volt-Mac
    Level 1 (0 points)
    Oct 17, 2014 9:58 PM in response to Volt-Mac

    Hi,

     

    I have the same issue with this monitor using Thunderbolt on my Late 2013 6-core Mac Pro with D500 GPUs. I get no image displayed until I get past my FileVault login and it takes me to the desktop. I have to enter my password blind as nothing is displayed at all during the boot. This also prevents me from choosing boot drives, or allowing other users to unlock the FileVault. The issue also occurs during a safe boot, and booting into recovery mode. My Mac Pro is running Yosemite, however it hasn't fixed the issue. I have tried a PRAM and SMC reset, however it hasn't changed the issue over Thunderbolt.

     

    I have contacted LG (which is of no use as their support is really terrible), and Apple who actually sent my issue to engineering. However, engineering was only able to assist me with getting the HDMI working again. To get HDMI working, they had me do a PRAM reset with it plugged in using HDMI. They were unable to get the Thunderbolt working though, as the monitor is not officially supported.

     

    I have been unable to find anyway to make the Thunderbolt work correctly on this monitor. This is very disappointing as this monitor is advertised by LG as being supported by the new Mac Pro.

  • by XiozTzu,

    XiozTzu XiozTzu Feb 22, 2015 8:27 AM in response to Volt-Mac
    Level 1 (0 points)
    Feb 22, 2015 8:27 AM in response to Volt-Mac

    I have a similar issue.  I share this monitor between other computers using HDMI and DisplayPort connections.  Flipping to an active DP or HDMI connection works fine.  I can switch to Thunderbolt and half the time it does not respond and the display goes to sleep mode.  I usually have to power off monitor then power on and it will notice.  Also, whoever put the input selection on a sub menu, not direct from circle selector should be fired. (Who cares about Reader mode?)

     

    What are the chances that LG will provide a firmware fix or that Apple will support the monitor officially?

  • by levente.ludnik,

    levente.ludnik levente.ludnik Nov 16, 2015 7:11 AM in response to Volt-Mac
    Level 1 (0 points)
    Nov 16, 2015 7:11 AM in response to Volt-Mac

    I have the same no screen issue when booting. LG 34UM95 + MacMini 2014 late with HDMI (never tried with Thunderbolt). Does anybody have solution?

  • by levente.ludnik,

    levente.ludnik levente.ludnik Nov 29, 2015 12:02 PM in response to levente.ludnik
    Level 1 (0 points)
    Nov 29, 2015 12:02 PM in response to levente.ludnik

    I reinstalled 10.11.x (El Capitan) under the Recovery menu (OS reinstalled/ programs stayed), after that I did a fresh install too (totally recreated the Fusion Drive group, partition and I installed OS) and the boot screen problem stayed. After that I did two fresh installs with Windows 10 Pro and after that with 10.10.5 (Yosemite) and those are perfect. So the problem is with the El Capitan OS! I hope Apple will fix it soon, because I want to use the El Capitan!