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•Remove the ethernet and telephone cables from the back of the ATA
•Unplug the ATA from the wall (not from the back of the ATA--I got sparks doing it that way)
I had the bad luck of needing a new ATA sent out after moving it. Although it's hard to know why it stopped working, the above procedure should avoid the most likely causes (i.e. electrical spike due to lack of grounding, or data being written to the unit at the moment of powering it down).