I left town and returned to find the APC xs 900 sounding a steady beep and the overload light flashing on the unit. It was not doing that before I left. Only 2 devices plugged into the unitl (PC and monitor). I reset by turning the power button off and then on again. The "online" light blinks for a moment, then the "on battery" light blinks for a moment and goes back to the online light staying on. After about 1 minute the overload light comes on and the unit beeps a constant beep.
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