In the Nvidia web driver prefpane, mine also doesn't show a monitor. I don't know why. Also, the GTX 1080 does not have ECC VRAM, so it's just going to show ECC Not Supported.
Typically, black screen can be attributed to a few things:
- System definition set to iMac17,1 or MacPro6,1.
- SIP settings. I have been using 0x3 on all my hacks since I started hackintoshing and have never had issues. 0x3 is the default set by MultiBeast.
- Emulated NVRAM not set up correctly.
Also, in BIOS, after enabling the IGPU, make sure to set your GTX 1080 to primary.
You should only downgrade to the .104 Nvidia web drivers if you are experiencing "the lag".
Lastly, please fill in your user profile with your CPU, motherboard, and GPU info. It makes it much easier for other forum members to help you.