I turned onn my Mittss RPTV this morning and all I have is verticel colors. None of the imputs do anything. The self generated screens still work. Menu, volume indicators, color bars, ect. This TV was $3500 three years ago.

Try unplugging it for a few minutes to see if that changes anything.

If unplugging does not work, see if there is an AV Reset button on the TV itself and push it. That will get rid of any changes made to the TV. If you have made any changes to any of the factory settings, they will have to be redone.