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Old 10-16-2011, 11:29 AM
Joey P Joey P is offline
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Join Date: Jun 1999
Location: Milwaukee, WI
Posts: 26,843
Those popping sounds are usually accompanied by a burning smell or the scent of ozone. If you don't smell that and you've changed and/or checked all the outlets I'd be worried the sound was coming from the wiring inside the walls.
IMO, the next step would be to cut the power and check for shorts.

Have you recently hung any pictures where you may have driven a nail into a wire?