The web is usually a great way to help solve problems like this but in this case it was a bust. I did a search and came upon this thread since I have the same problem now as the OP. I have the ACS48 speakers on our family PC and they have been great for 7 years...then they just died. No power and the sub fuse is not blown. Sure I could go out and buy new speakers but I would rather bring these back to life if the problem is something simple. Any other ideas out there before I add to our local landfill?