Has anybody else ran into this? It's a relatively new refurb'd ibook that we just got. 1ghz, 256MB ram, 60G hard drive, OSX 10.4.1. The airport extreme card showed up in the mail today. I followed the directions exactly (not that they were very complicated, 2 steps basically) and after installing the airport extreme card I go to power the laptop on and all that happens is the fan turns on high speed and stays that way until holding the power button to turn it off. I've reset the card several times with the same result. If I pull the card out the laptop boots up perfectly normal. I'll be calling apple in the morning but I was just wondering if anyone else had run into this or ever heard of this happening before? I also tried resetting the PRAM and booting off the OSX cd, neither changed the situation.