Trying to hear the music

I bought a semi used KD-S5050 from a friend with, of course, no manual. After I hooked it up to test it,all looked well, it showed a station and all. When I disconnected to reconnect via harness....I get nothing. The power is there because I can see time and when I insert a CD it shows load and all the lights come on. Then nothing. Any ideas?...Thanks for any help....

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