I may have misread this, but is there a possibility that you changed the "v format" button in your frustration?
You might try clicking the "V Format" button, wait about 15 seconds (don't rush this step) and see what happens. If nothing, try it again.
I don't remember how many formats there are, but you have at least five, maybe more formats in the Openbox.
Of course, it you ARE using the HDMI this shouldn't effect the format, it's been a while since I messed with my setup.
Photto