Already answered but yeah, sounds very likely that you have a GPU, and the display cable isn't connected to your GPU.
Go for Arch Linux in a VM.
Create snapshots, break things, fix them. When you break stuff try to fix them even if it's hard. Solution from the internet? Try to learn why it works.
After Arch go for more low-level and 'raw' distros, like Gentoo. If you still feel like it's not enough, go for LFS.
Enjoy learning, and good luck :)
You could use Sound Toggle.
It's not *just* the DND toggle, but a sound mode toggle, open-source app.
if (input file) = path to file - here it's the downloads folder - just change the file name after the slash
of (output file) = here we'll use the device instead - enter the device you saw popping up - it should be /dev/sdX - don't add a number after (i.e. /dev/sdc, not /sdc1)
To stop a command (almost) anytime, press Ctrl+C. To enter a command you used already, press Up (↑).
GL!
E: don't instead of dont
Life.