First of all, my hardware that is or could be related to the issue: Primary monitor is a 2560x1440p monitor connected to my pc with a DP cable, secondary monitor is a 1920x1080 monitor connected with DVI-D (dual link) cable and my 3rd monitor is 1600x900 connected with VGA. My GPU is a GTX 960 (latest drivers, I checked) with 4GB of Vram. I'm running Windows 10 (updated from 8.1)
Now to the issue itself: I recently went to a LAN party and only brought my primary monitor. The LAN lasted for 4 days and then I returned to my own desk with the 2 other monitors. I boot up the PC and at first it only shows the picture in my 3rd monitor, not even detecting the other monitors. I reboot the PC, same issue. I reboot the PC with the 3rd monitor disconnected, it shows the picture only in my main monitor, not in the secondary one I also had plugged in. I connect all the monitors, restart the PC, and this is where the real issue begins: The PC shows the motherboard splash art, and after that, boots into a black screen with the cursor showing and the Windows 10 loading icon spinning on my secondary monitor. I reboot the PC, same issue. The thing is, I can still operate my PC while it's in this mode. I could (basically blindfolded) type in my password and (still blind) shut down or restart the PC from the desktop. I tried disconnecting my secondary monitor, only leaving the primary one and the 3rd one plugged in, and the problem is gone. I can operate my PC normally. Then I tried plugging the secondary in again, and the issue occurs again. Please, dear LTT community, help me.