So yesterday I bought a Colecovision and some games from a store that specializes in old consoles.
They hooked everything up at the store to make sure it worked, and it did.
Now, though, I can't get it to work.
No video or audio shows on the TV.
But it was just working yesterday?

I checked the hookups and everything's fine.
I know the audio/video cable works because it just showed up on the TV yesterday and I know my TV is fine because my Atari shows up on it.
I don't know what to do.