Can any genius out there help me please? Everything has been fine on my little Alba TV with combination DVD. However, I just happened to press sub-titles, by accident, on my remote control and since then I haven't been able to get sound on my dvds. The TV part is fine. The sub-titles are off and it's not on mute. I've checked the settings in the audio part of the menu and just can't resolve it. I've also read the manual several times. Any ideas?