did you hockup the antena lead to the card. Becasue most people that put in the Aiprort card there self over look that one part. If did it might not be setted all the way down. There should not be any of the copper part showing at all. Be it on a "Airport B card or a Airport G card". You alsom might check to see if the antena calbe might be bad. I had that same thing happen on my Power Mac G4. I had setted the card all the way and had even made shere that the hockups where right just to find out that the antena cable had been bent and so there for had broke. Sorry about all the mispells not that great at spelling. And I'm not drunk.