Thank you from my family!!! your solution worked!!

Thank you had the same thing happen and is now fixed

Thank you very much pushing both volume buttons fixed.

Thank you for the advise on pressing both up and down buttons on the volume or channel at the same time, I had the same prob. and it really worked. Cual!

It WORKED. I've been messin' with this thing trying this and that and FINALLY got the bright idea to look it up on the internet! Don't know why I didn't think of that before; I usually look EVERYTHING up on the internet.
THANK YOU SO MUCH!!!!

It worked thanks....my Son is autistic and he had a meltdown cause his tv was stuck on demo...THANKS

Also, for future reference, if you can't find your manual, they are usually available on the manufacturer's website, at least for fairly recent electronics.