What would cause the radio to stop working and the car to not start?

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Radio recently went out, relay switch was removed, and it came back on and was running fine for three days. New battery and alternator has been checked. Lights on dash and headlights will come on. Will not turn over or jump. Radio is also not working again. Service soon light is on. Drove today turned it off, tried right after to crank it and it won't do anything.