Why won't I get sound from internal and USB speakers?

You my friend have an issue with your sound card now because it is a laptop there is a very small (albeit not zero) chance you can do anything about it

What is happening is that for some unkown reason the audio card on your motherboard has broken and your computer is unable to process any sound that an app is telling it to play (think 0101010110101 being thrown at your computer and it having zero idea about what to do with it)

Try to type into your google search bar chrome://system/ then Ctrl+f and type into the newly appeared search bar audio and you should be brought right to a little box that says audio_diagnostics and press expand then back to the little search bar again type "card 0" (thats a zero) and you should see something like what is shown below

In binary format:

cras_test_client --dump_events

There are 0, snapshots. === aplay -l ===

****List of PLAYBACK Hardware Devices ****

card 0: sofglkda7219max [sof-glkda7219max], device 0: Speakers (*) []

Subdevices: 1/1

Subdevice #0: subdevice #0

This is what is personally on my chromebook but the bolded text will be different. On the topic of that bolded text copy it and paste it into google and search replacement for example mine would be

sofglkda7219max replacement

If you get hits for a replacement then good news it is fixable, but will cost a lot of money because (i assume) there will be microsoldering involved, however if there is nothing listed then unfortunetly there is nothing you can do about your audio card but if you see nothing immedietly keep looking because it could take a while to find because the part you have is ultra specific

Sadly though I assume that you won't be able to find anything because laptops aren't like pcs and almost everything is made by the company who makes the laptop so repair usually isn't an option

I bet you will be overwhelmed by the amount of text you don't understand in the audio diagnosis section but as long as you Ctrl+ f everything you should be fine

Sorry for the absolute novel hope it helped though!