Monitor turning on and off and quickly flashing a red line only while displaying in 4K 60Hz

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FriedRice1080p

PCHF Member
Dec 27, 2022
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So, my monitor, a Z-Edge U27P4K 27" 4K IPS, only has 1 HDMI 2.0 port, so in order to use both my Series X and PC (in 4K 60 hertz) I bought an HDMI 2.0 switch and a 1 foot cord to plug into that. (So basically I have 2 HDMI 2.0 cords running from my PC and my Series X into the switch, which then connects into my monitors single HDMI 2.0 port through another HDMI 2.0 cable). As soon as I did this my monitor started flickering on my PC every so often and these weird either red or blue lines appeared about a quarter way across my screen horizontally. This only appears when running my PC at 4K 60 of 59 hrtz, not at 1440p or on my Series X at 4k. Plugging my PC into the monitor directly fixed the problem, but I don't understand why only 4k is causing this problem on only my PC. I already unplugged-replugged everything I can and reinstalled by GPU's drivers and the issue still persists (less so now but it still happens sometimes and is quite annoying). If it helps to diagnose, my monitor seemed to flicker a lot more when I was running Razer Chroma Lab and games of any sort at first (hey monitor just did it again twice while typing this lol) but now these programs only cause the "normal" amount of flicker. By PC specs are listed below and I'd appreciate any help, since I don't want to constantly be unplugging my PC and Series X whenever I switch between the two.

PSU: Corsair CX650M

GPU: ASUS Nvidia GTX 1660-Ti OC Edition 6GB

Motherboard: DELL 0m9kcm (I "built" this computer from an Optiplex 9010)

CPU: Intel i7-3770

RAM: 2 Samsung M378B5273EB0-CK0 & 1 Hynix HMT351U6CFR8C-PB (12GB total, each stick is 4GB DDR3

Storage: Crucial MX300 525GB

I'm sorry if any of the information seems repetitive of as if I'm talking down to ya'll, I just want to cover all my bases, I'm sure you guys are much smarter than I am hence why I'm consulting you. I also want to repeat that this all started when I tried to use 4K 60FPS with the switch, this setup was running fine at 1440p 60FPS and 4K 60FPS without the switch, and my Xbox works fine with the switch.

Thank you in advance and happy belated holidays!
 
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