new radio issue

well as some of you know I installed a radio a few weeks ago and the next day it was gone. well yesterday I got a new one and hooked it up just using the factory wiring harness but I'm considering running new lines but need an amp first. anyways with the stereo hooked up I turned it on and had some sound but couldn't hear much I didn't have the antenna plugged into the head unit so it made since. anyways start heading down the road and I'm not hearing anything through the speakers well when I get home I start looking into it more and find the harness for the speakers is messed up so I bypass it and connect directly to the wires behind the connector and still nothing so I pull out the speakers and test them and they are all working fine so then I hook the speakers up the head unit with new wire and nothing still so I warranty the HU out and now with a new unit still nothing. any ideas? I have a 6 speaker setup the only wires i have hooked up are the red/power, yellow/constant, black/ ground and solid blue/ antenna.I don't think I need the amp wire hooked up since it doesnt need one.

It doesnt have a factory amp. A friend of mine said to check and see if the pos and neg some how touched eachother and could throw the radio in a limp mode of sorts. He said the radio should have a reset button.

The army doesnt give combat action ribbons I need to change it I was trying to put the badge on but im not sure you can. What I need to do is just pull out my DD 214 and quite being lazy.

head unit lights up just doesn't turn on. I checked WM and no luck on the scohse probe thing so idk.