I’m perplexed

NS 6 Mic inouts not working

have an NS6 and can't get a mic to work on it!!! I have PC (Serato) on ch 1 and 2.
Channels 3 and 4 both have the 6.5 phono mic input with switch (mic/line) and I can get the line (RCA) to work on both channels but not the mics. Tried corded and cordless mics and multiple leads.....HELP!!!!
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