All wired up, but no sound

So I've got my Metra kit that keeps the chimes and I'm putting in an old aftermarket HU I had sitting around. I pulled this from my previous car, and it worked then... maybe it doesn't work anymore (but it powers up)?

Anyway... so I connect the Metra wire kit between the factory wire harness and the HU wire harness. The Metra red (power) wire from their little chime box to the red wire on the HU wire harness, same with the yellow to yellow and black to black (yellow and black both run to a fuse box on the aftermarket wire harness).

I then connected the speaker connectsion from the aftermarket HU wire harness to the Metra kit (color to color and color/black to color/black). I've got four sets of hookups then: green, white, grey, and purple (with the black stripe wires there are 8 total connections).

I don't need the antena lead as there is no power antena, so nothing goes there from the aftermarket HU wire harness.

I plugged everything in, the chimes work, and the deck turns on... but no sound. I've checked the fader, balance, and volume on the HU, and all is fine there.

I still have 3 wires coming from the Metra to Factory connection that have nothing to them. Two orange wires, and one blue/white wire. I can't seem to figure out what they are for... but does this have something to do with me not getting sound?

First time I've tried to hook up a stereo before. I've done speakers and amps before, and wired a house... this shouldn't be that hard, but something isn't work out right here.

Anyone have some ideas, besides telling me I'm dumb? (HA, Ha, ha)

Thanks.