Dual monitors, HDMI works fine but DVI isn't displaying anything

[daddy_snuffles]

I powered down my PC this morning, and unplugged everything in order to touch up some cable management around my desk. Good news is, It looks much more neat than before, the bad news is, now my 2nd monitor that was hooked up via DVI, isn't displaying anything. HDMI works fine on my first, and my second monitor. I unplugged the HDMI then booted up my PC with just the DVI to see what happened, and I saw the Windows logo pop up, then the screen went black, I plugged the HDMI back into the first monitor, and immediately a display came on, and I was able to type in my password, and sign in. I don't know what the issue is, but it's definitely not the monitor, nor do I think it's the cable.

 

[daddy_snuffles]

Little more info for anyone that wants to help
Intel i7-2600K CPU
Asus ROG Strix GTX 1060 6G GPU
Asrock P67 Extreme4 Gen3 mobo
2x4GB Sticks of G.Skill Sniper RAM
Cooler Master Silent Pro Gold 1000w PSU
and it's all being displayed on dual Acer H236HL monitors