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 Preferences, click Accessibility , click Spoken Content, then select “Speak selection”.
To hear alert messages on your Mac, choose Apple menu > System Preferences, click Accessibility, click Spoken Content, then select Speak announcements.
Make sure the output volume is turned up on your Mac; choose Apple menu > System Preferences, click Sound , then click Output.
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. If you’re using a Mac notebook computer, you may need to press Fn-Command-F5.
If you’re using an app that speaks to you, check the app’s preferences to see if you need to select an option to hear the app’s messages.