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  1. #1
    Dell u2719d Monitor not working with Mac Pro 2010
    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”.
    Any ideas of what is the issue and how to fix it? I hope you can help me.

  2. #2
    Dell u2719d  Monitor not working with Mac Pro 2010
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
    Posts
    6,175
    Your Mac's Specs
    L2014 Mac mini macOS 14, iPhone 8+ iOS 12, 12.9" iPad Pro 1 iOS 12, Pencil 1
    Try both an NVRAM rest and an SMC reset.

    https://support.apple.com/en-us/HT204063
    https://support.apple.com/en-us/HT201295

    If they don't help, try to start up in Safe mode, https://support.apple.com/en-us/HT201262.
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  3. #3
    Quote Originally Posted by ferrarr View Post
    Try both an NVRAM rest and an SMC reset.

    https://support.apple.com/en-us/HT204063
    https://support.apple.com/en-us/HT201295

    If they don't help, try to start up in Safe mode, https://support.apple.com/en-us/HT201262.
    Thank you for replay I tried all 3 and still the same results. Any other ideas?

  4. #4
    Dell u2719d  Monitor not working with Mac Pro 2010
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
    Posts
    6,175
    Your Mac's Specs
    L2014 Mac mini macOS 14, iPhone 8+ iOS 12, 12.9" iPad Pro 1 iOS 12, Pencil 1
    The only other thing I can think of, is that the graphics card, can't power that new ultra hi-def monitor? How much ram does the card have onboard?
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  5. #5
    @ferrarr It work well, as long as I start with the old monitor and then connect the new one, while logged in.
    It is with the original MacPro Video ATI Radeon HD 5870 card with 1G memory.

  6. #6
    Dell u2719d  Monitor not working with Mac Pro 2010

    Member Since
    Dec 11, 2010
    Location
    Chicago
    Posts
    1,796
    Your Mac's Specs
    late 2012 mini w/SSD
    I would check the monitor's settings - maybe it is set for the wrong connection (or wrong sync, etc) as first choice. Obviously, this is only if it has two connection inputs like DVI and HDMI, for example. I once had this trouble with a Dell monitor, but since I set it to "automatic," it has been working OK.

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