UPS ES-750 constant tone won't stop

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I have a UPS ES 750. Just started to emit a constant loud tone. Green power light is solid, no red lights anywhere, no beeps, just the constant tone. Can't turn it off. Power button doesn't work. Holding down the power button to reset also does nothing. I have unplugged from wall and also removed the battery and reinstalled it - still no luck . What could be wrong ?

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