Then I tried to reset the Xbee's by ATRE command followed by ATWR.
Then I tried to configure the Xbee's by X-CTU which didn't work either.
On the other xbee the associate lamp isn't given any light at all? Have I killed it?
I've tried several combinations with different Arduino's shields and Xbee, and seem to locate the Xbee to be the problem?