The subwoofer does not have sound. but everything is on and everythin works,the subwoofer is in there is just no sound comin from the subwoofer.

One always needs to check that the Subwoofer speaker and the cables are not "open circuit" with an ohmeter before doing anything. This is easily done by just disconnecting one speaker lead from the amp output and checking for continuity overall, then looking further if an open circuit exists.

Please change the cable which goes from the subwoofer to the AV receiver. Buy one good quality cable this will sove your problem. As i was facing the same problem and i myself resolved the issue.