I just got a 8700k and put it in my fans started spinning, the cooler and its rgb lit up and the gpu was going but I had no display on my monitor. I went back to the 8100 i was using before and still got no display. I used different gpus and still got nothing. I took all but 1 stick of ram out and got to the Bios menu and then desktop. I moved the ram to different slots and no display came up so I moved it back to the original slot and nothing happened. I tried the other ram in the set and a different set and still got nothing. Even resetting bios didn't do anything.
SPECS
Windows 10 64 bit
ASrock z370 pro 4 (Bios ver. 4.20, latest)
Zotac GTX 1080 mini
I7-8700k
4x8gb ddr4 3000 Team T Force Dark
TOSHIBA DT01ACA100 1TB HDD
High Power HPL-800BR-F146 800w 80plus bronze cert.
Other Parts I used
MSI GTX 1050 ti
I3-8100
G.Skill Ripjaws V DDR4-2666 8Gx2