Thanks for posting in the Apple Support Communities dosai22,
We recommend providing some additional information, to increase your chances of getting a helpful response from the community. Where were you seeing the icon? Did it appear for a specific app? What kinds of sounds were being played? What happens when you try to play sound now?
The more information you can provide about what you mean to accomplish, the better other member's understanding will be, so the most helpful and relevant information can be offered.
Cheers!