No Sound from Classroom Laptop or Other Aux Source

To use a laptop or other auxiliary source with the classroom audiovisual system, connect it to the system and select the corresponding input source on the control panel. If the device is connected correctly, the audio should automatically pass through the system speakers.

Solution

1. Check the laptop connections; they should fit securely.
   1. If using HDMI, a secure connection will pass audio along with video.
   2. If using VGA, connect the auxiliary audio cable to the laptop's headphone output.
2. Turn on the audiovisual system with the Crestron control panel.
3. Crestron control systems include a Mute feature for some system inputs. Navigate to the Volume page and then select the Advanced Volume Controls page to check if the media player is muted.
4. If the No Sound indicator displays on the control panel, push the No Sound button to deselect it. Use the Volume menu to adjust the audio level.
   1. If the classroom uses a handheld remote control, press the Mute button to verify mute status and use the Volume control to adjust the audio level.
5. Select the correct input source with the audiovisual control system.
   1. On a Crestron control panel, choose Laptop for VGA connections or Auxiliary HDMI from the Source page.
   2. On an ELMO document camera, press the Laptop button — indicated by a laptop icon or labeled Laptop.
   3. For systems controlled via handheld remote, use the remote to switch between available sources.
6. Check the auxiliary device's sound controls to toggle mute settings and adjust the volume. On a computer, find the speaker icon in the taskbar (bottom right for Windows; upper right for Mac). A slash or X indicates muted audio. Click the icon to open the sound control and unmute. Use the volume slider to adjust the audio level.
7. If the above steps fail to resolve the issue, restart both the audiovisual system and the laptop.

Workaround

1. Try wireless presentation if the room is equipped and can play desired media from a laptop or phone.
2. Upload the files to OneDrive and open them on the classroom PC.