I have an NM-1FE module that I just installed in a 3640 that displays green LEDs for EN (so it passed its self test), 100Mb + Link... so everything "appears" to be normal. However, when performing a show int, show run, show controllers, etc... there is absolutely no Fast Ethernet present.
It's receiving power, passing its self-test, and even detecting keepalives on the link...
What else can I do? (other than getting a new NM-1FE-TX :)
Thanks for your time!