Solution found...
It was an IOS incompatibility. I have updraded the IOS to a more recent version and it works fine.
The router shipped with something like 12.4.3 and I upgraded to 12.4.15 and it works fine now.
I have the same problem installing HWIC-1FE in a 2811. I have tried all 4 slots. All leds on the WIC come on when router is powered up and stay on solid green even without the network cable connected.
Thanks!
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