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Will need to know what tv you have, but you are right it is probably your input button. if you pushed it on your remote then there should be an input button on remote. otherwise you will have to go into the tv menu and setup it up there. if you respond with model and make of tv, might get more info.
Press the menu button.Go to the scan button.Manually enter in the channel you wish to add.Press the volume or channel button to 'add'it and if you press it again it will show delete(probably volume,many different brands have different ways to do it yet still basically the same).Do the same for all the channels you want.I use delete for channels such as C-span and a couple of other nonsense channels I do not really care to watch.Even if a channel is deleted,you can still watch it by manually entering the channel number on the remote.After you finish,hit menu to exit the setup.
i think by accident you have changed the input when you went to change the volume. look for a button labeled " input" or "video" select on the remote and scroll through the various choices. you should get your picture back.
I bought my Insignia 32" LCD in November 2007 - same problem. I figured out that if you press the "input" button on your remote select any of the other options "component 1, composite 1, etc.. that you're TV isn't on -then press "input" again and go back to the component that you're TV plays on - you'll have volume when you go back every time. I've gotten so used to doing it now that it's become habit. 9 times out of 10 I have to do it.