1998 Ford Mustang radio problems

I have a 1998 ford mustang. The radio, cassette, and cd players all don't work. I had found a wire that was not attached and soldered it back to where it had disconnected, thinking that was the fix, but it still doesn't work. The clock on the radio face works fine, so I know that there's power going to the radio. The radio/cassette player is a bit rusty, but the cd player looks pretty good. I am lost now for what to do. Help.