I have a Macbook Pro 2015 running Mojave 10.14.6.
I have absolutely no sound output both from internal speakers and headphones, even the startup sound doesn't play. Microphone input is fine. The sound settings are OK, connecting and disconnecting the headphones is recognized correctly, no red light from the headphones jack socket. No peripherals are connected, Bluetooth is turned off.
I tried:
- Reboot, multiple times
- Install the latest system update
- Reboot to safe mode
- Reset PRAM
- Run
sudo killall audiod
- Log in a guest account
Any other ideas? Thanks!
Best Answer
I know you've already reset the NVRAM (what you're referring to as PRAM), but the first thing I'd try is to reset both the NVRAM and SMC in that order. Before following the steps below, ensure you have no external hardware connected and make sure you use the built-in keyboard.
Reset the NVRAM
Your Mac uses Non-Volatile Random-Access Memory (NVRAM). Here’s how to reset the NVRAM on your particular MBP:
Note: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc).
Once done, proceed to resetting the SMC as well.
Reset the SMC
To reset the System management Controller on your particular MBP, follow these steps:
After resetting both the NVRAM and SMC, use your Mac to determine if you still have no sound output.
If it doesn't, then it's time to test your hardware with Apple Diagnostics.
Run Apple Diagnostics
Follow the steps below to run Apple Diagnostics:
Note: If pressing and holding the D key at Step 3 doesn't work, start again at Step 1 and, at Step 3 press and hold both the OptionD keys instead. This will try and run diagnostics from the internet instead, so you will need to allow more time for it to complete.
Regardless, take a note of what happens and let me know how you went.