The head unit works but no sound is getting to the speakers

[Simonolly]

I recently bought a 1999 subaru impreza wagon and in it there is a JVC head unit that seems to work, i can put cd's in and out and all the controls seem to work, but i hear no sound coming out of the speakers, I asked the old owner and he said one day the sound cut out. I open it up and pull the head unit to see if there is any obvious problems, from what I found one wire (orange) is not connected to the head unit, there two slots for wires open on the connector that connects to the head unit, and there is a random 2 wires with a connector not connected to anything. I'm not much of a electrical/audio guy so I was wondering if someone could help me with this because I have no idea

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