Question about Behringer Um300 Heavy Metal Distortion Effects Pedal

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I havn't used my UM300 in only two days, last time it was working pretty well ... better than ever, today morning i woke up and tried to use it, but all im getting from the amp is a buzz in a very low volume ... i checked all my cables and the amp without the pedal, all worked perfect ... but the pedal doesn't seem to be operating :s

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Dead battery or disconnected power adapter. Leaving cables connected discharges battery in a day as this is what switches the battery on. (The input cable)

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