Try your system preferences. Go under the Apple in the upper left hand corner to System Preferences > Hardware > Sound. Click on Output and see if it's set to the internal speakers.
Try your system preferences. Go under the Apple in the upper left hand corner to System Preferences > Hardware > Sound. Click on Output and see if it's set to the internal speakers.
Try your system preferences. Go under the Apple in the upper left hand corner to System Preferences > Hardware > Sound. Click on Output and see if it's set to the internal speakers.