That doesn't sound like a problem with the monitor, unfortunately. You could disable display sleep on the Mac, I suppose.
I am running Yosemite 10.10.2 on a Mid-2012 Retina MacBook Pro without any difficulties.
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LG 34UM95 Display Boot Issue
- Thread starter B1ueB1aze
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That doesn't sound like a problem with the monitor, unfortunately. You could disable display sleep on the Mac, I suppose.
I am running Yosemite 10.10.2 on a Mid-2012 Retina MacBook Pro without any difficulties.
This monitor has proven very finicky with Macs in general, but in particular with Mac Pros, both old and new. It's perfect with my Windows PC, whether it be DisplayPort or DP via Thunderbolt.
I had the same no screen issue when booting. LG 34UM95 + MacMini 2014 late with HDMI (never tried with Thunderbolt). 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!
just wanted to chime in here, I started a thread yesterday about the same issue, it's here. Full details are there, but put simply, I bought the monitor a little over a month ago and can only get video to display from a cold boot of my Mac Pro. This is making me very sad.
Just wanted to add that I was also having the issue of selecting the bootdrive on startup or running recovery mode. The screen was not detecting an input source until it booted into OSX. It worked on hdmi but not thunderbolt but the issue was resolved by simply plugging into the first display port as mentioned earlier by MMcCraryNJ. Now I can select boot drives with the display port.
Edit: I'm using a Samsung 28" UE590 4k monitor
Edit: I'm using a Samsung 28" UE590 4k monitor
Double edit, after multiple attempts I haven't been able to reproduce this. Apparently swapping ports before restarting temporarily solved the problem but it has returned. I wish there was a permanent solution but for now I just select my boot drive by memory with a blank screen and eventually it show the login screen (hopefully on the correct drive).
I solved by install Windows 10. The problem never came back again with Windows since about a half year.
I solved by install Windows 10. The problem never came back again with Windows since about a half year.
I don't know how that's a solution for this issue. I don't think Windows has ever been a problem, it's the LG monitor on Mac Pros running OS X that is the issue. If you set Windows as the startup disk, there is no issue, even with Windows 7.
I have been using this monitor with a 2010 Mac Pro (EVGA 680) flawlessly, with conditions, since release. I did initially have some similar problems, but as long as I don't let anything sleep it's fine. If I let either side sleep then I have periodic issues.
It sucks, but aside from that finicky behavior, it's a great display.
Edit: Just realized how old the thread is, and that I posted previously.. doh.
It sucks, but aside from that finicky behavior, it's a great display.
Edit: Just realized how old the thread is, and that I posted previously.. doh.
I have a gtx680 but use the web drivers and sleep has never a problem.
I do get intermittent sleep issues if I use the OS X default drivers though, namely to wake the display up you have to turn it off at the button under the logo and back on again and it comes back awake, so no big deal really.