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What I tried to do is setup my desktop setup like so that I can switch my display input of one display between dedicated and integrated graphics. The reason for this is so I can continue to use my computer decently while I do render projects in Blender in the background.

To do that I tried to just enable IGD in my BIOS.

My problem:
Nothing shows up when I connect my integrated HDMI port to one of the displays (both displays try to connect but can't)
Display 1 (eizo) works fine until I switch to the main-board integrated HDMI port then the display shows only black and the input sign on the top right is slowly blinking. Additionally I can't give my display any input anymore except to turn it off (can't switch input again until I disconnect and switch input)
Display 2 (lg) begins to disconnect/connect instantly and additionally the disconnect/connect sound from windows 10 is playing.

What works:
-In the display settings of Windows 10 the third display is getting recognized. I can customize my settings there without problems.
-Integrated graphics when the GTX 1070 is removed.

What I tried to do without success:
- Set the integrated graphics to standard.
- remove all all cables from the dedicated graphics card and only using the input from the integrated one.
- integrated graphics on either display
- different cables
- searching for a dedicated setting in the Intel/NVidia settings panel
- tons of Google research

I'm clueless about what I'm doing wrong, if you know something I'd be very glad for help.

My rig:
Intel i7 6700k
MSI Z170i Gaming pro AC Motherboard
DUAL-GTX1070-O8G graphics card
Eizo FS2331 display 1 (connected via DVI)
LG 22LE5500 display 2 (connected via HDMI)
Windows 10 Pro
Samsung 950 Pro 512Gb M.2 ssd
Crucial Ballistix Sport 2x8Gb ram