My openbox locked up after scanning in 4 channels on AMC 3 when I pressed the vformat button. It shows a screen "no osd show, press v.format key to switch." I can't get my menu button to work, but after pressing the v format key several times it goes the the menu. I reset everything to factory reset, but can't get rid of the "no osd show, press v. format key to switch screen, and can't recan any channels back. It's like the unit is locked up. Any suggestions, thanks.