Question Computer displays corrupted image, USB messed up

[Btg312]

I was going to post about my computer having issues where USB WiFi cards would cut out with too much bandwidth and my wireless peripherals being slow, but a greater issue has emerged. The boot screen, bios, and windows all have this red tint with yellow dots. Windows will load for a second but then stutter indefinitely at the login screen. This happened when I removed the graphics card. With the graphics card I couldn’t get any output.
I have a feeling that these are both symptoms of a dying motherboard. I’ll list my specs below. I’d list the graphic card but I can’t get far enough into the computer to see its name:
MOTHEBOARD: Gigabyte B365M D3SH
CPU: i5-9600K
RAM: 2x 8GB EvoPoenza Ryzen
SSD: 1x 512GB M.2, 1x 512GB SATA SSD
Thanks for your help!

 

[hedwar2011]

How is your monitor connected to your PC? HDMI? DisplayPort? VGA?

Unplug and reseat the connection. Try a known good cable.

 

[Btg312]

How is your monitor connected to your PC? HDMI? DisplayPort? VGA?

Unplug and reseat the connection. Try a known good cable.

Gosh, I am so stupid.
I reseated the HDMI but it didn’t work, so I tried a different cable. Apparently my original cable decided to stop working, because now everything works! I’m still having the USB issue, but I’ll have to make a different thread for that. Thanks so much!