Right audio channel nearly inaudible - Realtek HD Audio Manager

Hello,
I can only hear Mono from my computer:
I just bought a new headset (which is working perfectly fine on a different computer) and the Stereo sound is not functioning.

(Note that it says "Speakers" and not headphones? Does that mean something?)
This is my current configuration (Main Volume slided all the way to the right) and I can hear NEARLY nothing.
Just a tiny bit of sound.

But when I slide it to the middle or to the left, then I have Mono sound.

I tried sooo many proposed solutions on the internet. Including but not limited to:
updating drivers,
reinstalling drivers,
troubleshooting,
switching the Source device for the headphones (this works but I want to keep my computer, obviously),
switching the Output device from the headphones to a pair of speakers (the speakers have the problem that only 1 speaker would make sounds. With the headset both sides make sounds, but it's Mono).

Does anyone have an Idea what could be wrong?
Or is the computer-output just broken? Is there a way to find out if that's the case for sure?


Windows 10 Version: 1903 (OS Build 18362.836)

Minor update:
I found under Ease of Access audio settings, "Turn on mono audio" was set to true.
I turned that off and now there is no sound coming from the right channel.
Is that a sign that my audio output is broken?
Can only 1 channel become broken, while the other is fine?

dalchina said:

Hi, a couple of things that may be of interest:
- note the balance controls- check the settings.
- the Test feature so you can hear each channel separately.
Can you hear that?
Have you checked your Volume Mixer settings? See this (or similar):

balance control: I tried a bunch of different settings there. When putting both on an equal level, 1 channel is loud, the other nearly non-existent.
after testing: The left channel is definitely working fine. But I'm barely getting real sound out of the right channel.
volume mixer: That one looks normal:

dalchina said:

Try creating a new user for test purposes. Log in as that user, and then check sound.

Completely new User, same issues...
This will probably mean that my computer is broken, doesn't it?

Man. That sucks.
Booting with another OS sounds like too much trouble (because I don't know how, and I have a very limited download capacity right now... ("like 1GB is 2€"-limited))
Since my Motherboard is 7 years old by now, I might as well update the hardware and hope that fixes it.

If it DOES fix it, I will try and update this so other people with similar issues can find this.
If it does not, I will start joining the current riots just to break stuff to vent my anger.

Thanks for the help though. I appreciate it.