I recently purchased a Dell U3419W and everything worked out of the box. I was happy with my dual monitor setup until out of nowhere and with no tell -my U3419W monitor suddenly stopped working. It just displays a black screen and sometimes vertical lines. I know that when I press the monitor buttons although it doesn't show the settings on the display- I know that it's there. I've even tested it myself -when I was messing around with the settings, I was receiving a response from the monitor. The problem is that nothing is able to display. I cannot see anything. My computer does recognize the monitor, I can move my mouse into that monitor window but I just won't be able to see anything happening.  

Here's my computer specs:
OS: Windows 10 Pro
CPU: AMD Ryzen 7 3700x
Motherboard: TUF GAMING x570-PLUS (WIFI)
Ram: 16gb
GPU: MSI GT710

My gpu can support 1 HDMI port that I'm using for my Dell U3419W monitor and a DVI port that has an HDMI/DVI cable- which is what I'm using to support my 27" Dell monitor. I'm going to see if my HDMI cable that I'm using for my 34" monitor is perhaps the problem or is it instead driver issues. This whole issue began when Windows 10 failed to shut down properly.