I’m frustrated

ZMX122FX No input signal

Hi, I have 2 year old but barely used ZMX122FX. I got it out but I can't get it to register a signal from any of the inputs! The power is fine and it seems to register the output but I just can't get it to register any signals going in. I've checked all the leads, the output speaker, looked over all the settings and I can't see why it's not receiving any signals on any channel. I've worked with mixers before and am baffled. Is there something I'm missing?? Thanks!J
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