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Before you buy a new ribbon cable, deinstall the chip and see if the ps2 works. If it does, use the chip's pass-thru ribbon and connect it to your ps2 & reset/eject buttons, but don't connect any of the wires and check it again. If it works when you do that, try soldering the wires back, but take good care when connecting pin 1 (black wire) because if you went through the previous steps and everything worked, pin 1 was most likely the culprit.
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