13 days ago - AndrewT - Direct link
Run the game up then alt-tab out to the desktop. Right click on the speaker icon in the taskbar , open volume mixer. Scroll across until you see the game - check it is not muted or set at a really low level.

If that is not the problem,
DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach here your Documents/Paradox Interactive/EU4/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/EU4/logs/ folder, attach here system.log , error.log .  
12 days ago - AndrewT - Direct link
In that dxdiag the sound is set to:
Luidsprekers (UMC404HD 192k)
which I think are plugged into a USB port. I see no installed driver for the monitor speakers, the other two options there are:
Digitale audio (HDMI) (High Definition Audio Device)
Realtek Digital Output (Realtek(R) Audio)
In general that last one would be the best choice, it's presumably the built-in sound hardware in the computer's system board. Can you try that channel as your sound output please?  
11 days ago - AndrewT - Direct link
Hard to see why the sound setup would affect the map.

You could try deleting everything in the Documents/Paradox Interactive/EU4 folders except any valued save games.