Kyle, Have you found a resolution? I have the same results with a Mini and a Insignia 23" LED display. It appears by reading other messages here is the problem is with the Mini's HDMI and most HDTV sets not just Insignia. I have been trying to resolve for a week with no luck.
UPDATE: My problem seemed to be with the overscan feature of the Insignia panel. The option was "greyed out" and would not allow disabling. I switched to a 23" Samsung panel and it works fine. I am now using the Insignia as a secondary display.