UD-3900 wont drive 3 monitors but Win10 sees all 3 displays

Hi Tim,

No worries at all. Thanks for capturing that second set of logs.

In this most recent set, I see both HP monitors recognized by the computer. However, one is being set to disabled by the computer.

I provided the instructions for enabling a display that is set to disabled previously, but I understand that you stated the system is indeed set up for extended mode. Can you double-check if that setting “stuck” after you changed it? It could have reverted back to “disabled”.

  1. Close or minimize any open windows, then ensure all monitors are connected (even though one is not working)
  2. Right-click on the desktop and select Display settings from the drop down menu
  3. Under Rearrange your displays, select the “greyed out” display from the diagram that you are having issues with a single left-click on the icon. You can click “Identify” to help you understand which monitor corresponds to which number label
  4. Scroll down to the bottom and select Extend these displays from the drop down under Multiple displays

We also have a video that outlines this exact issue with our UD-3900 if you might want to quickly take a look at that: https://www.youtube.com/watch?v=irAUYfdTp4I

With this HP monitor being disabled, that clearly explains why it isn’t displaying properly, so we’ll want to figure out this detail to move forward.

Thanks!

Mitchell