Mac mini (MB463LL/A) giving static sound

Hi,
I have this mac mini - MB463LL/A - and it has worked perfectly well without any issues all this well. But of late it started giving a static sound (don't know how to explain it, but it sounds like a sound from radio transmission or FM). It's continuous and constant - doesn't matter what the volume is. I have tried removing my speakers and tried with my headphones but I have the same issue there - so it seems like an issue with the hardware. Any ideas on how can I figure out what could be wrong and what should I do to get it fixed. Appreciate your help.
Thanks, Kalyan

No external hard drive is connected, but I have a usb drive connected that's needed for my wireless keyboard to work on mac mini. No grounded outlets around, but it sits under by HDTV and the only change in the recent past around the set up has been my new Airport Extreme wireless router. Earlier I used to have Airport Express and bought this one recently - if that's of any help.
Thanks for your help

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Mac mini (MB463LL/A) giving static sound

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