Have you tried remotely testing it? As in using a different power source? Just seems like a hiccup if you're not getting any power. Maybe even a sensitive amp. I know my kenwood deck would give me errors all the time when I tried to install it. Wether I'm wrong or right about how I fixed it, I THINK there wasn't enough continuity within the speaker wire. I cut the the wires shorter and had less wire available, worked after that.
I use to hook up amps and subs for testing with various speakers and such. I say start with the power source though.