Speaker off Someone just gave me their old Mitsubishi CS-27407 27". I hooked it up through my directv connection, no problems there, but there was no sound, and it said 'speaker off'. The previous owner said he had it hooked up through his sound system, but it had been so long since he hooked up the tv he couldn't remember how he turned off the speaker (and no longer has the owner's guide or remote control). I can't find anything on my directv remote that might help, and there's nothing self-explanatory in terms of the buttons on the front of the machine. Help!