Hi all.i have 2 xtrons hd121hd headrest monitors. While i was fidling with 1 of the 2 using the remote a menu came out of the 2nd one.i think i selected something on that menu and found out that the selection for the input source for the hdmi and usb on the list was gone. I think i disabled those when that menu came out accidentaly. Pls help, anyone know how to bring out that menu? I think you have to press a combination of keys on the remote to bring that menu out. Because i tried all the buttons on the remote but that menu did not come out. Pls help on how to make that menu appear. It seems like a hidden/secret menu. Thanks!