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What if you power up the mixer without anything connected?
If it's showing levels without connections, I'd consider it suspect.
Otherwise, plug things in one by one, of course with your speakers turned all the way down so you dont blow something up, and see when the noise starts.
You might have DC on the line somewhere, alot of the cheaper mixers aren't properly DC bypassed and will show DC as a signal level, but it's not audible. It's a voltage, so it'll move meters, level lights, etc, but doesn't alternate so it makes no noise.
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