3570k, HDMI, Garbled screen, can't sleep. Please help.

I've been running Hackintosh rigs for a long time, but I'm just stuck with Mojave and need some help. I had 10.13 running well, but I just can't get this one sort.

I updated my main rig to the latest hardware and I've decided to turn my current rig into my media server for Plex. I'm planning on running it headless, but I've got it connected via HDMI right now. I've installed Mojave and got it running fairly well. Some things seem to be new with the Hackintosh scene since my last build, and I've got a new 4k display which from my searching and testing over the last couple of days, I've discovered might be an issue. Anyway...

I still get a garbled screen after a clean install and using multibeast. However, when remote connecting, it shows that the HD4000 is working fine, although only at 1080p. I figure the garbled screen is because of the HDMI connecting to a 4k display. It also won't go to sleep.

Could I please get some help fixing these two issues (mainly the sleep one).

Hardware:

Z77-UD5H
3570k
HD4000
8GB Ram

Issues:

Won't sleep (screen sleeps, PC doesn't)
Garbled screen when connecting via HDMI