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4108 bad modules

RobB_8
Advisor

4108 bad modules

I have a bunch of modules for a 4108gl that appear to be bad... when I insert them they go thru diagnostics and then the light for the slot and the self test light flash. I have tried the modules in another switch and same result. The switch does not appear to detect the modules when you try to configure it. I cannot imagine all of them had gone bad, unless the switch took a power hit, but then why would know good modules work in the same switch???
Thoughts?