They usually have power supply issues if driven too hard for long periods of time. You may have a amp failure as it powers up.:scratch2: Remove the plate amp and look for burnt or discolored parts. There use to be a member on the Klipsch factory forum that repaired the amp/power supply and did not charge too much. I looked and now that the forum has changed a lot of the old threads are gone :thumbsdn: Post up on the Klipsch forum and see if that member still repairs them.