We will need to verify if the issue that you are having is caused by the cable connections or settings on your Slingbox.
You can try unplugging the audio/video cable and connecting it again. Also, you can use another audio/video cable and configure it, to see if the issue persists on another input. If you still have the same issue, we recommend you to reset the Slingbox and configure it again. Use the link below to receive the instructions on how to reset the Slingbox.
If you need additional assistance, make sure to include the following information:
Which A/V cables are you using to connect your AV source to the Slingbox?
Which Slingbox do you have?
Do you have the same issue on your TV?
We recommend you to be as specific as possible about the issue you are having. This way, other forum users will be able to help you with accurate information.