If you can’t hear your Mac speak
If your Mac doesn’t speak, you may not have selected anything for it to speak, or the volume might be turned down. Here are some solutions to try:
To hear text that you selected on your Mac, choose Apple menu > System Settings, click Accessibility in the sidebar, click Spoken Content on the right (you may need to scroll down), then turn on “Speak selection.”
To hear alert messages on your Mac, choose Apple menu > System Settings, click Accessibility in the sidebar, click Spoken Content on the right (you may need to scroll down), then turn on “Speak announcements.”
Make sure the output volume is turned up on your Mac; choose Apple menu > System Settings, click Sound in the sidebar, click Output below Input & Output on the right (you may need to scroll down), then drag the “Output volume” slider to the right.
If you use VoiceOver on your Mac, make sure it’s on. Press Command-F5. If you don’t hear the VoiceOver greeting, press Command-F5 again. If you still don’t hear the greeting, check the volume settings. See Turn VoiceOver on or off.
If you’re using an app that speaks to you, check the app’s settings to see if you need to select an option to hear the app’s messages.