Installation stuck at: "Window Server Service only ran for 0 seconds"

[SirFlederic]

Hello there!
I am getting stuck at this while booting from high sierra installation USB.

com.apple.xpc.launchd[1] (com.apple.WindowServer) <Notice>: Service only ran for 0 seconds. Pushing respawn out by 10 seconds.

My Hacknitosh was running with Sierra, then I successful installed Mojave. Recognised that my Graphics is not supported yet.
Tried to install HighSierra, but no success, even not reached the installer. So I erased the SSD for clean installation. But also no success.

I use the following boot flags:
-v
nv_disable=1
slide=0

my Setup:
Motherboard: ASRock Fatal1ty X99X Killer Intel X99 So.2011-3 Quad Channel DDR4
CPU: Intel Core i7 5820K 6x 3.30GHz So.2011-3 WOF
RAM: 32GB Crucial Ballistix Sport DDR4-2400 DIMM CL16 Quad Kit
Graphics (for Installation): Nvidia GeForxe 8400 GS
Graphics (regular): 2048MB Gigabyte GeForce GTX 750 Ti OC Aktiv

I found some similar threads, tried to fix it, but nothing worked for me.. so I hope someone can help me
Thanks!

 

[SirFlederic]

still no success.. any ideas?