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How to cold reset an APC !
- Unplug the back plug to unplug the battery.
- Plug the ups in the wall outlet.
- Hold the test button until it beep two times.
- When the second beep happen, you release the button right now while it beep.
- If released too late, then re-do it !
Didnt see this how-to on APC, but got it on the phone with em. Saved some UPS live that way :-) (most of all saved the downtime to the client for sending the unit to APC for a simple cold reset)