Well, I thought I had this taken care of. Today, I unplugged my sub to connect it to another outlet so that I could move it around a little, and I once again have a buzzing/humming/fluttering type of problem. It is coming from all speakers and the sub, and is variable with the volume. I have tried disconnecting and reconnecting every combination of components, including going down to the reciever alone, and still have the same sound. It is still present when everything except the reciever is unplugged, but is not present when I switch to an input that is not being used, or when I switch to the input that I am using for my desktop, which is on another outlet. I've tried switching the reciever to separate outlets, and still have the same problem.

Ok, a little more experimenting, and I think the problem may be with my tv. The buzzing sound is still there on the front speakers, even when the cable is disconnected from the TV, the TV is unplugged, and the TV is totally disconnected from the reciever. However, when the TV is on, I can hear faint sounds coming from the speakers through the buzz, even though it is on a different input. I don't know if this is a related problem or not. I'm really lost here, any help, or recommendations would be extremely helpful.