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EL34: I would suspect that there is something in the house that got turned off, A noise problem. A TV, Video Game box, Power supply to something... any of these could cause a problem. My wife's Laptop when plugged in no mater where will give me problems somewhere. I gave her a plug-in filter and she uses it whenever she uses the AC power adaptor.I have 2 battery chargers for a cordless drill. One is OK and the other causes noise.
Keep an eye on it and if it quits again look for something thats on somewhere.
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR