USB-C TO Displayport no longer working

[ECH3LON]

I've been using my Laptop with an external Monitor for half a year now. I connected the Monitor from the USB-C out to the Displayport in. This has been working absolutely fine. 2 days go when I turn on my Laptop it suddenly no longer finds the Displayport. I bought a new cable but the issue persists. The monitor is fine and it works with the HDMI to HDMI connection. The USB-C Port is fine too because it recognized other devices. 

Things I've tried:

Updating graphics drivers from AMD and Nvidia

Turning the monitor power off, replugging in and out 

Latest windows update

Everything from HP is up to date as well, even the optional ones. Newest BIOS etc. 

I'm forced to use my Laptop with the monitor via HDMI to HDMI now but due to the properties of the Monitor I have greatly reduced resolution and fps. Please help. 

[bob9999999]

Same with me. It was working about two or three days ago. But the difference is that the usb type-c does not seem to work. There is no power and it does not detect any device connected to it.

[ECH3LON · Accepted solution]

So I made this thread earlier this year and had the issue since then. I now found a solution by chance. 

New! Windows Update Replaced AMD Graphics Driver (1-Minute Fix) - YouTube

This video completely fixed it for me. The problem was caused by windows interfering with AMD drivers.