Monsoon MH500 Standby Mode Problem

I have a set of Monsoon Flat Panel speakers w/sub woofer (MH-500) and it's seems that they are going south on me. What happens is that after some idle time (about 6-8 hours, the noise woke me up at 2am this morning) a loud humming feedback type of noise is illicited. I think that this is happening when the speakers go into standby mode. The mute button and volume control on the puck won't even stop/suppress the sound. I ended up unplugging the speakers and I have been doing so before I go to bed for the last week since it first started. I've had the speakers for 6-9 months and they just started illiciting this behaviour about a week or so ago. Any ideas as to what's causing the humming/feedback noise? The only thing that I can think of is that it's plugged into a power strip (surge suppressor) that's about 10-12 years old. Somehow I doubt that the strip would be causing problems but I'm reaching here...

Any information would be greatly appreciated!

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More about monsoon mh500 standby mode problem
  1. What kind of soundcard do you have?
    What happens if you unplug them from the sound card?

    - JW
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