[Al Skierkiewicz]

sevisehda,
Sounds like you blew the sub woofer amp. I have heard of a lot of systems doing that due to the high power of the system. Some sound cards do not effectively mute audio during power up and the transient makes it through to the sub and makes max power for a short period of time. This sometimes causes the speaker coil to come right out of the magnet structure. This will usually fry the coil and send a short back to the amp. Hope it's under warranty.