What type of channel (SD or HD) is affected?
Your box should allow you to do 2 things:
1. Adjust resolution / format output (480, 720, 1080) to any format acceptable to your monitor. You can select non-HD format for SD channels so that the box will output a 4:3 SD image to the monitor and the monitor's aspect settings can properly stretch / justify aspect. (Versus outputting the SD channel at upconverted 720/1080 which causes the box to add bars to the 4:3 image to produce a 16:9 image that generally can't be changed by your monitor).
May need to re-setup your box to allow for this. Download user guide and setup wizard from SA's website.
2. Adjust aspect settings from normal, stretched or zoom. Last resort method to:
a. Removing bars from an HD channel broadcast of a 4:3 SD show in which the network / affiliate added the bars when broadcasting the upconverted signal as 16:9.
b. Removing bars from an SD channel output by the box in HD (rather than adjusting the output in #1 above).
I find that my monitor stretches / justifies better than box thus I use #2 rarely.
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