NO sound device found (P R command/ option doesn't work)

If resetting the NVRAM is not working, you might want to reset your SMC

See this on how to do that:

On MacBooks with the T2 Security Chip:

Before resetting the SMC, follow these steps:

1. Shut down your Mac, if possible.
2. Press and hold the power button for 10 seconds, then release the button.
3. Every Mac has a power button. On laptop computers that have Touch ID, press and hold Touch ID.
4. Wait a few seconds, then press the power button to turn on your Mac.

If the issue persists, reset the SMC:

1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.

• • Control  on the left side of your keyboard
  • Option (Alt)  on the left side of your keyboard
  • Shift  on the right side of your keyboard

1. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
2. Keep holding all four keys for another 7 seconds, then release them.
3. Wait a few seconds, then press the power button to turn on your Mac.

If you need help, contact Apple Support. 

On MacBooks without the T2 security chip:

1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of these keys:

• • Shift  on the left side of your keyboard
  • Control  on the left side of your keyboard
  • Option (Alt)  on the left side of your keyboard

1. While holding all three keys, press and hold the power button as well.
2. Keep holding all four keys for 10 seconds.
3. Release all keys, then press the power button to turn on your Mac.

If you need help, contact Apple Support.

On Macs with apple silicon:

Find out if you have a Mac with Apple silicon

Make sure that your Mac is plugged into power. Then either restart it or shut it down and turn it on again. No other steps are necessary for Mac computers with Apple silicon.