You may be able to solve the issue yourself by doing the following steps:

1. Check the audio device settings of your computer.
2. Verify that the sound is not muted.
3. Check the audio settings of the presentation.
4. Verify the audio file format.
5. Check the computer’s audio volume level.
6. Restore the audio from previous slides.
7. Reselect or relink the audio file.
8. Enhance the audio.
9. Check for audio file corruptions.