Your problem might be the output rate. Try GB, then press the right arrow. This will reset the output rate to a more acceptable level.
If that still doesn't help, your display doesn't sync to HDL's basic rate (you're not alone, there are a few people who reported this). In this case, you'll need someone with an HDL (probably KeyDigital's support staff to reset it for you). They can give you instructions on how to change resolutions blindly (without seeing what you're selecting).
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