If the amp turn on then the only thing I would mess with is the signal input. I would pull the rca out and use a rca to 1/8" jack and play from another source Luke a cell phone. If it plays then it's a problem from the head unit or rca. I would swap the rca first and see if it plays.
Do try pluggin the rca in to the full range speaker slots. See if it will play. If still no then your Hu is jacked up and get a new one. If it plays then the Sub output slot may either need a certain setting on or that output jack in dead.
YzGyz
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