OS 10.9.5  

     System prefs: Sound:  play sound effects thru internal speakers IS selected

     other sounds on MacBook play fine

OL  14.4.5

    program prefs: default alerts are selected

Mail arrives and the laptop email OL client displays an envelope icon, but no sound is played.

I've tried the solutions suggested in other posts, and these do not work for me.

Can anyone suggest something else for me to try?