There are several reasons why it might happen. Please check that:
- Your sound card and loudspeakers are working properly . You can perform a quick technical test clicking on: https://technical-test.gamelearn.net/
- The volume is properly adjusted (mute mode off).
- The firewall of your company is not blocking the access to the .mp3 (audio) or .flv (video) files of the game. Please contact your IT department or set our web page as “safe site”.