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Hi ti, My name is John. Welcome to FixYa. Usually when this happens, you have to go into the menu and do another channel search (auto search) or scan, but make sure you have all your cable, wires hooked up properly. While in the menu, make sure you have selected the country that you are in. Thanks for choosing FixYa......John
Check the cable between the monitor and the box for damage.
Try a new cable.
It may be a problem with the input board but it sounds like a cable problem.
Let me know what you find and please rate this solution. Lone99star
These are the answers straight from the dell manual.
Ensure that the audio cables are firmly connected to both the audio input connectors on your LCD TV and audio output connectors on your PC or Video player.
If on certain TV channels you receive a picture but no sound, this means that you do not have the correct TV system. Modify the SYSTEM setting.
Check if TV volume is turn off of muted
Connect the audio cable securely
Audio cable is connected incorrectly
Verify that the audio source is selected correctly in the OSD