Emerson flat screen TV LC220EM2 is a 19" Hook up is fine and shows tv guide perfect, but once it is on a channel, no visual, screen is blank. It is set on channel 3 for cable, but it says mono. I don't think it is suppose to be set on that, but do not no how to change it. Someone slept on the remote, and now I can't get it back to the original settings. How can I fix this? Auto channel set up does not acknowledge any digital channels