How do you have the box connected to your TV?
There are 3 options on the DSD4121, HDMI, Component & Composite.
HDMI is by far the best option if your TV supports the connection.
The symptoms you are having are usually experienced with a bad connection of Component cables, however it may also be possible with HDMI.
Suggest trying new cable or at least disconnecting & reconnecting the cables. Turn the unit off while playing with the cables.
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