Black Screen when playing games in Full Screen with a Dual Monitor setup?

your RTX 2070 should be able to support two screens at once with different content. Removing the second [and different] gpu card should sort out the problem your operating system is having here.

just so you dont waste any more time and in case you didnt know this. Almost all LCD display will NOT display any data if the screen dimension are not set to the one and only screen size they want to display. In some cases pressing the MENU button on the display may show you what the Input dimensions(your data) are so you can see what you have done wrong. This is different to old analogue displays that could easily show many screen sizes and just had issues with refresh rates. And while i mention it your lcd will also have set refresh rates it can display. * note the display may be auto-detected and may not be answering properly. That would probably be a gpu driver issue or the method of connection of display to gpu socket.

Create a virtual machine through software inside Windows, use that to run your "secondary" functions while the game runs in the normal hardware.

But since you have only one CPU, the game and the secondary stuff will run at half speed or maybe slower.

I am not familiar with what you are trying to do. I see what you cannot do.

Your motherboard is AMD crossfire compatible but not NVidia SLI compatible.

There is DX-12 Explicit Multi-GPU capability of some games. Both monitors are 1920x1080 and have hdmi input. At least the Acer has displayport input.

The CPU runs one thing at a time. When you move from gaming to the other window, the gaming stops. You can't make two computers out of one with two graphics cards.

Try pulling out the gtx 1060.

If you can't do what you want on one GTX 2070, you probably can't do what you want to do at all.

Starrysky described a virtual method to split your cpu in half creating two computers, if it works.

Your issue is in trying to use the gtx 1060 as a separate computer.

A game that runs in full screen usually takes over full control of the video card, and thus will pick one of the two cards you have installed (unless they are in SLI, which you don't say). Windows may figure out 2 cards, but most games won't.

To use two screens, whether on two video cards, or one card with two monitors, you have to run the game in "Windowed Mode", to allow Windows to maintain control of both screens.

That's usually what happens when a monitor can't display the resolution that the video card is trying to use. Perhaps your game has an override for full screen mode.