U2719D, 2010 Mac Pro, not working

Question

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 behavior.

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 recognized 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”.

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

DELL-Chris M · Answer

For Dell to troubleshoot, you need to test the U2719D on a dedicated Windows operating system PC to see if the issue is present. You can see on the U2719D drivers page and also in the U2719D User's Guide that the Apple proprietary hardware and operating system were never tested/validated by Dell. You should also post the issue on the Apple Forum and see what other Apple users have done as far as Apple PC troubleshooting.

BatD361 · Answer

Thank you for the reply. The monitor works well on Windows, but issue with MacPro.  I am a bit surprised that such an expensive professional monitor may not work on Apple computers.

davidSch · Answer

Same problem on LinuxIt is a shame, that Dell ignore other operating system

Monitors

U2719D, 2010 Mac Pro, not working

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