Mac Pro 2010 can not start with Dell u2719d Monitor

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Level 1

8 points

Mac Pro 2010 can not start with Dell u2719d Monitor

I have Mac Pro 2010 with MacOS High Sierra and with the original “ATI Radeon HD 5870” video card.

I have been using it with old Philips Display connected using DVI-DVI cable.

I recently purchased Dell U2719d and having trouble getting it work.

I have tried connecting the Mac with either Mini-display to Display and with Mini-Display to HDMI cables and get the same behaviour.

When the new Dell monitor is connected and I start the Mac, the display stays black and I get message “No signal from the Display Port”. However if I boot the Mac with my old Philips monitor and then connect the new Dell after login, it works perfectly well and is recognised by the Mac. It continues to work ok even if I then disconnect the old monitor, however if I reboot the Mac with only the Dell monitor, I get again “No signal”.

I tried different cables and different options from DVI to Display Port, Mini Display to HDMI and MiniDisplay to Display. I tried resetting NVRAM, SMC and starting in Safe mode. but no change.

I tried with different laptop and the monitor is fine.

Any ideas of what is the issue and how to fix it? I hope you can help me.

Mac Pro

Posted on Jan 30, 2019 1:57 PM

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Answer 1

Jan 30, 2019 2:35 PM in response to dos1

To get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, no data will be sent to the display.

This query is only sent at certain times:

• at startup

• at wake from sleep

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• on invoking Option-(Detect Display) button in Displays preferences

so try doing some of those things and see if the display comes alive.

Modern Displays with multiple ports are sometimes busy scanning the other ports, looking for an input, and miss the query from the Mac. They need to pay attention to the port you are actually using, or they will miss the query.

Some displays have On-Screen Display settings that can be used to tell the display a computer is attached on a certain port, or a certain port should be highest priority. Changing those may make your display more responsive.

Some displays include their own private "sleep" settings for the display alone. This can allow the display to enter its own sleep mode, on top of the Mac's not sending it data. A display that is sleeping on its own cannot respond to the Mac's query, and will stay dark.

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Answer 2

lllaass

Level 10

210,519 points

Jan 30, 2019 2:58 PM in response to lllaass

Try this:

No image

when using DP

connection to

the PC

Black screen • Verify which DP standard (DP 1.1a or DP 1.4) is your

Graphics Card certified to. Download and install the

latest graphics card driver.

• Some DP 1.1a graphics card cannot support

DP 1.4 monitors. Go to OSD menu, under Input

Source selection, press and hold DP select

key for 8 sec to change the monitor setting from

DP 1.4 to DP 1.1a

Above from the manual

https://dustinweb.azureedge.net/media/420778/ultrasharp-u2719d.pdf

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Answer 3

DonH49

Level 6

16,716 points

Jan 30, 2019 2:24 PM in response to dos1

using the Dell setup located on the display make sure you set the connection type. if that does not do it then change the display sleep using the dell to not. if that does not do it then replace the display.

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Answer 4

lllaass

Level 10

210,519 points

Jan 30, 2019 2:30 PM in response to dos1

Seems like the monitor is sending a signal about the monitor to the card and the card does not recognize the monitor that is why you are getting no signal.

I do not know of a solution

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Answer 5

dos1 Author

Level 1

8 points

Jan 30, 2019 11:33 PM in response to lllaass

Thank you so much. This has actually fixed it. I read the guide previously, but missed this bit somehow.

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Mac Pro 2010 can not start with Dell u2719d Monitor

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