Asus monitor display artifacts

Rand

So i built my rig about 2 months ago and its worked like a dream... up until about a week ago, random games would display weird horizontal line artifacts covering the bottom 2 inches of the screen, but only in certain games. It does perfectly via hdmi to my TV. The panel isn't damaged, changing refresh rates and resolutions had no effect, cable connections are secure i've updated every driver I can think of. The only thing that had any effect was changing the display mode to gaming on the monitor, but that fixed it only for some games, and at this point Idk what to do.
Here is my Build Ryzen 7 3800x,

Asus Tuf gaming  X570-PLUS (wifi), Asus Dual RTX 2070 Super, 16 GB 2x8 D4 3600 mhz ripjaw, WD 500 GB NVME SSD SN750, 2 TB Seagate barracuda 3.5 HD, EVGA BQ 750W 80+ Bronze SM ATX. And an Asus 23.8" VP249 monitor. The following pictures are to show how the monitor performs during different activities, please help!

TSTonyV

You said it displays fine when attached to your TV via HDMI, are you using the same cable when doing so, or are you using a different cable?

My first thought for this would be switch the cables, since that's the easiest thing to do. Otherwise, if it's not happening when attached to your TV your GPU should be fine and it's likely an issue with the monitor itself. 

Rand

I was using the display port cable but, switching to the same hdmi I used for the TV, didn't change it. However I did find out that it runs in windowed mode just fine? I don't think it's the gpu and its definitely not the cables.

TSTonyV

Usually if it's a GPU problem, artifacts will always always be present regardless of what you're doing, however I would assume the same if it's a problem with the monitor itself. If switching it around between windowed/full screen affects this, we may be looking at a software or a driver related issue. 

Try doing a clean install for your video drivers: https://community.microcenter.com/discussion/2858/how-to-roll-back-or-clean-install-video-card-drivers-in-windows-10