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U2515H - "no signal coming from your computer"

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U2515H - "no signal coming from your computer"

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Just received my U2515H, hooked it up to my computer using the mDP to DP cable provided in the box and immediately got a black screen telling me that there was no signal coming from my computer. I manually selected the input as mDP, so that shouldn't be the issue.

I'm running an Asus Rampage V Extreme mobo so i have a dedicated graphics card: a NVIDIA GeForce 980ti with 2 DP, 2 HDMI, and 2 DVI inputs.

Any suggestions on what might be the cause? I have tried unplugging and restarting both my computer and the monitor with no luck. I have a second U2515H arriving tomorrow, so I'd hate to have the same issue twice.

All Replies
  • * Turn the monitor off
    * Disconnect all cables from the monitor including the power cable
    * Press the monitor power button in for 30 seconds
    * Reconnect all cables and retest. Make sure the cable ends are fully seated

    Did you test both DP out ports on the GeForce 980 Ti into the monitor mDP in?

  • This happened to me when I enabled DP 1.2 option in the menu.

    If that is the case, you do not have a DP 1.2 compatible hardware and software/OS. (perhaps if you are using a linux machine)

    When your monitor tells no signal... push a menu button for about 10 seconds. It will show you other input sources, keep pushing. Then it will bring a menu to disable DP 1.2. Disable it. Restart the computer.

    Hope this helps

  • DELL-Chris M

    * Turn the monitor off
    * Disconnect all cables from the monitor including the power cable
    * Press the monitor power button in for 30 seconds
    * Reconnect all cables and retest. Make sure the cable ends are fully seated

    Did you test both DP out ports on the GeForce 980 Ti into the monitor mDP in?

    I have tried the method of powering down, disconnecting, then reconnecting cables. This may sound like a silly question, but how do you press the power button for 30 seconds on a U2515H that doesn't have physical buttons?

    I have tested both my DP out ports on my graphics card.

  • tanfera

    This happened to me when I enabled DP 1.2 option in the menu.

    If that is the case, you do not have a DP 1.2 compatible hardware and software/OS. (perhaps if you are using a linux machine)

    When your monitor tells no signal... push a menu button for about 10 seconds. It will show you other input sources, keep pushing. Then it will bring a menu to disable DP 1.2. Disable it. Restart the computer.

    Hope this helps

    Thank you for the quick response. I will attempt this method at my first opportunity and let you know how it goes (I'm running Windows 10 Pro BTW).

  • Good point, the manual does not make it clear that the button is not a physical button. Just pull the power cord and all other cables and wait 30 seconds.

  • tanfera

    This happened to me when I enabled DP 1.2 option in the menu.

    If that is the case, you do not have a DP 1.2 compatible hardware and software/OS. (perhaps if you are using a linux machine)

    When your monitor tells no signal... push a menu button for about 10 seconds. It will show you other input sources, keep pushing. Then it will bring a menu to disable DP 1.2. Disable it. Restart the computer.

    Hope this helps

    Sorry to say, this method didn't work. Thanks for trying, though. 

  • DELL-Chris M

    Good point, the manual does not make it clear that the button is not a physical button. Just pull the power cord and all other cables and wait 30 seconds.

    Sorry, no joy. Still the same issue: the monitor insists that there is no signal coming from the computer and puts the monitor in power saving mode.

  • I think that your video card supports DP 1.2. The default out of box setting in the U2515H is DP1.1a or DP 1.2 Disabled. Did you enter the OSD (On Screen Display) -Display and change it to Enable? Read pages 25-27.

  • DELL-Chris M

    I think that your video card supports DP 1.2. The default out of box setting in the U2515H is DP1.1a or DP 1.2 Disabled. Did you enter the OSD (On Screen Display) -Display and change it to Enable? Read pages 25-27.

    Referencing p.32 ("Using the Front Panel Controls"), I do not have the option of selecting a Menu icon to get into enabling or disabling DP 1.2. (in fact, i have NONE of these icons on my screen). Pressing these buttons only brings me to the input selection where button #1 (from left to right)  = up arrow; button #2 = down arrow; button #3 = check mark; & button # 4 = red x so that I can select DP, mDP, HDMI (MHL)1, or HDMI (MHL) 2. 

    Long-pressing (10+ seconds) button #4 locks and unlocks the monitor, but long-pressing button # 3 brings me to an option to enable or disable DP 1.2. I've tried both options and have had no luck. 

  • DELL-Chris M

    I think that your video card supports DP 1.2. The default out of box setting in the U2515H is DP1.1a or DP 1.2 Disabled. Did you enter the OSD (On Screen Display) -Display and change it to Enable? Read pages 25-27.

    Just opened up my second Dell U2515H and hooked it up to see if the first one was an oddball with its lack of OSD. Nope. The second monitor did exactly what the first did and only showed me options for input method - no OSD. I think the User's Guide that Dell created for this model is copied and pasted from another User's Guide because there are no options to do what the manual suggests. 

  • DELL-Chris M

    I think that your video card supports DP 1.2. The default out of box setting in the U2515H is DP1.1a or DP 1.2 Disabled. Did you enter the OSD (On Screen Display) -Display and change it to Enable? Read pages 25-27.

    Got frustrated and took the HDMI cable off my tv and hooked it up to the monitor. et viola, the monitor works. Just not with the DP cables. and now i can see the OSD. Unfortunately, you can't get to the OSD unless the monitor has a picture on the screen, which, if you're in the boat that i was in at the beginning of this, doesn't help much. 

    I still want to hook up the DP cables instead of HDMI, though. 

  • Ok, with the HDMI still connected and both computer and monitor on, connect the DP cable from the video card to the monitor. Can you then use the Input Source select and choose DP?

  • DELL-Chris M

    Ok, with the HDMI still connected and both computer and monitor on, connect the DP cable from the video card to the monitor. Can you then use the Input Source select and choose DP?

    I'm not sure if this is what worked or why it would work, but my monitors are responding to the DP cables now. Of course, now my computer intermittently hangs on Post after hooking up the monitors, but that's another issue.

  • Hi, I have a similar problem. When I connect dell xps 13 or 15 to U2515H monitor with HDMI it goes into power save mode. I also only get the 'input source' options and cannot go to the main menu. Are there any solutions yet?

    Many thanks!

  • Hi! I've had this problem for a long time and it now seems to be finally solved.

    I just had to update my Asus GeForce 970 firmware to version 1.0:

    BIOS update for STRIX-GTX970

    Fix DP display issue with certain monitors.

    www.asus.com/.../

    I hope it helps. Thanks,

    Sergio