Do one stick at a time until it goes wonky, I guess.
There is a math puzzle way of doing it faster but one at a time is probably the best. But also keep track of the slots. You may have a bent snapped pin in the slot. Once you verify a bad one try a "good" one in that slot.
If it is a slot you can get your magnifier, your clean air blaster, your DW40, your emery board (in that order, each is more dangerous) to clean.
Try a blast of WD40 then a blast of air. A tiny mirror and a bright light to look into it helps too. It might be just one pin touching another. I bet it is a short and the the short grounds out when you seat the stick.
Don't worry about WD40 mucking anything up. Short blast and let her sit for twenty minutes before you fire it up because there might be an infinitesimal chance the short causes a spark and you would really fire it up.
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