DVI Port "Broken"?

DeltaFour

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Apr 5, 2017
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So, I got a GeForce GTX 1070 graphics card about 3 months back and it's been fine with my desktop (Running Win8.1) since as on the same day I added on a second monitor.

Both monitors are ASUS vs239's; pretty good LED monitors which include a HDMI, VGA and DVI port. My PC has two DVIs' and a HDMI (I'm not the best with hardware, so I don't know the exact port specs, if one is DVI-d and the other is something else; I've no idea).

For the past 4 months I've been fine with using DVI cables on both my monitors, and using a dual-screen. It's been great! It's for that reason that I was confused today to come home and find that one of my monitors was off (With the orange standby light), and the other was just on a blue screen (Not the BSOD.

Both are plugged in to my PC, and my PC still recognises both as it did yesterday and so on, but for whatever reason one of them had went off; so my first step in diagnosis was to switch the DVI cables.

From there, the monitors pretty much traded their statuses; the one that had previously been on standby came on (Showing the desktop), and the other went into standby. I narrowed down the problem further by trying the same DVI cable on the different DVI port, and the same result happened (Both traded statuses). I believe then that it is a problem with the higher DVI port, which would make sense, because it seems that the HDMI port next to it is doing the same thing.

I'm doing a computing course, and I'm fairly familiar with the internals of a PC and its components, though I'm not too experienced with actually performing operations inside of one, - I did have a look at the GPU, and couldn't figure out if anything is wrong with it or not. It doesn't move around.

I probably sound like an idiot, but has anybody got any advice of anything I can try..? I don't want to have to replace the graphics card as it's so "new", and I'm only a college student (17) so I don't want to be bugging my family for too much. The alternative is that I deal with single-monitor, but if any of you out there use dual-monitor; you'll know what I mean when I say it's just so useful to have two, and I don't really want to resort to just one.

Thanks for the time, if anybody has read this. I also apologise if this isn't in the correct catagory, as I'm new to the site.
 
Solution
Well, if you had Win 10, I could just say "night Windows update could do that" :) But I don't know if Win 8 works that way.
You can also check in Device Manager if both monitors are listed as working (no error codes?). If yes, I would try reinstalling graphic drivers as last hope.


Thanks for the timely response!
Well, I tried connecting both with the HDMI cable, and the two DVIs' separately to make sure it wasn't the monitors. HDMI doesn't seem to be getting a reaction out of the monitors, so I'm lead to believe that one of my DVIs' and my HDMI next to it have broken overnight.
Yesterday, my monitors were working fine, so both the ports must have been as well. I set up this computer a year ago, so I doubt it's the OS.
If all else doesn't work, I'll have to just purchase a splitter. Sucks really. I've no idea how this can happen overnight.
 




Hadn't thought of checking the Control Panel, but sadly it didn't provide any answers. "Rigerous Detection" couldn't find it.
However, what's weird is that my Windows Control Panel detects both monitors (As the one that currently is not on has the power supply cable connected to it and the computer); whereas the NVIDIA one only sees the one that is currently active.

I don't see how it could be an issue with the OS, as the OS was fine prior to today. I'm just as confused as the next guy as to how it could possibly have happened overnight.
 
Well, if you had Win 10, I could just say "night Windows update could do that" :) But I don't know if Win 8 works that way.
You can also check in Device Manager if both monitors are listed as working (no error codes?). If yes, I would try reinstalling graphic drivers as last hope.
 
Solution