Display's DisplayPort seems to be dead. How do I test it?

[Heinzen]

I used my PC hooked up to DisplayPort and when I booted it today I got no signal on my screen. I tried all 3 Displayport outputs from my Gigabyte 1080 and none of them would give me signal. I thought it was my GPU so I took it out and tried my 7700k's iGPU (HDMI on the MoBo) and it worked fine.

I hooked my 1080 back in with HDMI this time and I get signal. Now, I don't believe all three of my Displayport outputs (2 of which were untouched) would have died from working perfectly fine last night, but my display is kind of a budget one (Acer XF250Q). I have also tried another Displayport cable so it shouldn't be that either.



Is there anyway I can test my output or input and see which one is defective? Exchanging my monitor here in Japan will be a pain if its the issue since I dont have original packaging anymore, so I need to make sure it is defective.

Summary:

• 
  *Monitor used to work on Displayport until this morning;
  *Monitor only works on HDMI now;
  *Tested all 3 DP outputs from my GPU, none worked;
  *Tested different DP cables, nothing;

PS: I don't have access to a different DP screen

 

[Heinzen]

Found a solution. Apparently it is an issue if your PC stays on for too long? I don't really see why that is a problem, but hey, that's what it was mentioned.

If someone happens to come across this issue too, do the following. I thought it was too plain but in reality I didn't do one of the steps and apparently it was game changing.

1) Turn off your PC

2) Turn off your Monitor

3) Unplug Displayport

4) Unplug the power cord from the monitor

5) Read the step above and really do it

6) Wait for about one minute (I assume its for every capacitor have enough time to discharge completely)

7) Plug everything back in