You know the same thing happened to me today with my DIY sub. Disconnected everything to move my 100lb+ enclosure and when I hooked everything back up SILENCE!

Spent the better part of half an hour looking for a loose connection from the receiver to the sub.

I was about to unmount the amp and driver when I noticed that I had accidentally turned the gain knob all the way down. Turned it back to it's correct position, and everything was fine!

Sometimes its something simple!

Good luck with your sub!