I've been struggling with this issue for the past year now with no hope in sight.
At first whenever I attempted to plug in a second monitor (connected via DVI, HDMI, or even VGA) either one monitor goes black, or both monitors go black. I was unable to have two monitors give a display at a given time. Since the issue occurred i have replaced my video card four times, had my motherboard RMA'd, reinstalled windows 8 and 10 and have tested multiple monitors with several different cables, and of course tinkered with my display options, but still no luck.
I gave up on trying to solve this for several months.
Now, months later, it appears that no matter what I do, I am unable to get a display on my second monitor, while either having two monitors plugged in at once, or just using the second monitor on its own, I have no picture. (I still have picture on the monitor using HDMI)
* In the display settings, it doesn't detect or identify the second monitor.
* On-board graphics is disabled
* Nvidia Control Panel doesn't recognize the second monitor
* Monitor with DVI cable works fine on different computer.
* Replaced Video Card 4 times
* Replaced Motherboard
* Rolled back Nvidia Drivers
* Reinstalled Bios
* Reinstalled Windows 8 and 10
I've been in contact with my power supply manufacturer (Corsair) and they didn't believe it to be a PSU problem.
I've been in contact with Intel, and they don't believe it to be a processor problem