As you're probably aware, I've been trying to set my Dad up with a quality HT setup. Just as we're about to hit the last nail in this coffin, we realize his sub is DOA. Powers up, but no action. Currently using the line-in with a single RCA. Have yet to check with wires running to the fronts. It worked when he last used it. Doesn't work now. Switched out AVR's. Same results. blah blah blah Any ideas?