Update on this one, service was set up and replaced the motherboard and GPU. 
I have a Dell U2719D monitor which has been giving me the same problem for quite some time, but now it has rendered itself completely unusable.  I have both and HDMI cable and a DP cable, so I've tried both. No matter what I do, I always get the following errors: With HDMI cable: "No HDMI signal from your device. Press any key on keyboard or move the mouse to wake it up.". The HDMI cable is new, connected properly, I both press the keyboard and move the mouse. I get no response.  With DP cable: "No DP signal from your device." - The cable is properly connected. I've tried multiple times. I cannot get the monitor to connect to my Dell PC. It is insanely frustrating to the point where I may have to buy a new monitor if I cannot fix it. I've tried shutting down, disconnecting power, pulling out all cords. Nothing works. Any ideas?
XPS 8930, U2719D, no signal from device