Integrated graphics won't detect one of my two identical secondary monitors

[Swaggless]

Hey there, hoping someone here has an idea as to how I can fix this.

 

Here's my current setup/situation:

 

I have a 3 monitor setup: one Acer Predator X34 GS (1440p Ultrawide/180fps) and two old 900p/60fps cheap-o Acer monitors I bought almost a decade ago (both are model no "S201 HL", if that helps). The Predator I only bought a few days ago and is of-course my main monitor and the two cheap-os are just for Discord/Youtube/etc while doing something else on my main screen.

 

When I got my Predator I was upgrading from an older LG Ultrawide which could go up to 75fps, but I just ran it at 60fps. When I had that monitor, I ran all 3 monitors off of my GTX1080 and they all worked fine. Once I got the Predator, I decided to move the two cheap-os onto my iGPU (Intel i7-7700k) so they could run at 60fps while my Predator could use G-Sync and run at whatever frame rate my GTX1080 could handle (since I know you're not supposed to run multiple screens with varying refresh rates off the same GPU).

 

Here's my problem:

 

When I plug my secondary monitors into my Mobo (ASUS Prime Z270-A), one of the monitors is recognized and works perfectly fine (my leftmost one), and the other (my rightmost one) does not. It says it has "No Signal" and when I tell Windows or the Intel Graphics Command Center to detect monitors, it says there are none left to detect. Both monitors are using DVI cables. One monitor is plugged directly into a DVI port, and the other is plugged into a DVI to DP adapter which is plugged into a DP port. I've flipped which monitor is plugged into which port, and the leftmost monitor always works, while the rightmost monitor always doesn't. I've done the usual: I've plugged the undetectable monitor back into my GPU to make sure it still works (it does), I've restarted my computer, I've tried to force Windows to detect the monitor in display settings, I've uninstalled/reinstalled the Intel Display adapter from Device Manager, and I've tired rolling back to an old version.

 

I'm honestly not sure what to try next. It's not a bad cable, it's not an issue with the mobo port, it's not that the monitor itself is faulty, it has to be some disagreement between that individual monitor and the iGPU. The fact that these two monitors should be identical is what confounds me.

 

TL;DR:

 

3 Monitors. 2 are the same and cheap and plugged into the iGPU, one is expensive and plugged into the GPU. I did this so they could run at different refresh rates. One of the cheap monitors isn't detected by the iGPU matter what I do. Even though the monitor and all the compatible iGPU ports are confirmed to work on their own, that one monitor and the iGPU won't work together.

 

Spec/Equipment List:

 

x1 Acer Predator X34 GS

x2 Acer S201 HL

 

Operating System: Windows 10 Pro 64-bit

CPU: Intel i7-7700K

GPU: EVGA GTX1080 FTW

Mobo: ASUS Prime Z270-A

Memory: 16GB

 

If you have any more questions or if this is the wrong forum section for this post, just let me know. If I'm not working, sleeping, or in the middle of a game, I'll be checking this post. Thanks!