Question about Logitech Z-5500 Computer Speakers

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Loss of output speakeer power

I think that I have a fairly simple problem on my hands.
Simple as it may seem, I'm having a hard time trouble shooting it.
I turned on my system one day, and I noticed that I was not getting the usually power that I usually get. Everything works, but the system seems like it has lost a lot of power. There isn't that immediate noticeable thump that I get, and I have the bass turned right down. I've never actually cranked this thing up like a lot of people do, so I'm assuming that nothing is blown.
I can't figure this one out. Anyone have any ideas to the source of my problem.
The items that I'm using it with are my satellite receiver with an optical cable, and my home computer with surround card.
I've tried these items individually one at a time, and I still don't have the out power that I had before.

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