Dell 4K UP2414Q and Mac Pro

Question

Dell 4K UP2414Q and Mac Pro

I am using two Dell Ultra Sharp HD Monitors UP2414Q with my Mac Pro (late 2013) single processor quad core running el cap 10.11.1 with AMD vFirePro D300. The have been working seamlessly with Yosemite since plug and play install in April. Last week the Pro began getting hung ip upon boot up after 1/3 of the progress bar filled under the apple logo. The next thing seen was the generic arrow in the Right upper corner of the L monitor. The R monitor never initialized. They are connected via thunderbolt (mini Display Port) to display port. The only thing that will rescue is a hard reset with power button. I can also make it work by using HDMI out on Pro to HDMI in on Display. No crash then. However, I can only use one Display. I have tried Thunderbolt cable to mini display port input on Monitor, I have tried mini display to HDMI on monitor. Any of these hangs the boot up.

Can anyone suggest a diagnostic step or possible fix? Thanks....

Posted on Nov 17, 2015 8:38 PM

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Answer 1

lllaass

Level 10

210,411 points

Nov 18, 2015 1:10 AM in response to frankfacchini

- Try resetting the SMC and NVRAM/PRAM

Intel-based Macs: Resetting the System Management Controller (SMC)

About NVRAM and PRAM

- Try starting in Safe Mode

OS X: What is Safe Boot, Safe Mode?

- Boot to Recovery and repair the startup disk

OS X: About OS X Recovery - Apple Support

- If it is repairable reinstall the OSX

How to reinstall OS X on your Mac - Apple Support

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Answer 2

eludwig

Level 1

24 points

Nov 18, 2015 8:43 AM in response to frankfacchini

Have you verified that both monitors are okay? Meaning obviously, that if you try running with one or the other by itself, you are fine? Also, have you tried all of the ports on the back of the Mac Pro?

I have this exact same configuration (with the exception that I am running El Cap) and have not experienced this. I still experience intermittent problems waking the monitors up from sleep, but I've had that since day 1.

FWIW, I am no longer using the cables that came with the monitors, I switched to another brand (link) mostly just out of curiosity. These cables did change the waking up behavior slightly, but to be honest, it might just be a placebo. The problem still occurs.

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Answer 3

Nov 18, 2015 7:20 PM in response to eludwig

I have. They run fine. In fact, if I connect via HDMI to one monitor, let it boot and than hook up both monitors mini DP to DP, they run fine. It is a boot issue I think in El cap

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Answer 4

Nov 18, 2015 8:36 PM in response to frankfacchini

A few more details. HDMI to HDMI boots fine. If I connect Mini DP to DP and If I have the monitors powered off when it is booting up then turn them on after 30 seconds or so the screens work fine!

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Answer 5

Nov 18, 2015 8:38 PM in response to lllaass

I tried Complete El cap reinstall, PRAM reset, safe mode, disk repair. Did not help...

Thanks

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Answer 6

lllaass

Level 10

210,411 points

Nov 19, 2015 1:14 AM in response to frankfacchini

Run Apple Hardware test. Just note that lack of identified problem does not mean no problems, especially for graphics problems

Using Apple Hardware Test - Apple Support

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Answer 7

Dec 1, 2015 4:22 PM in response to frankfacchini

Still struggling. Now the waking from sleep problem also plaguing me. Seems related. No issue on hardware test. Hoping Apple solves this in next ver of El capitan...

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