I switched an Airport card from one G4 tower to another (swapping from one Airport base to another). The one I installed into did not recognize the card. Simply put, "The card is not installed". I did a search on troubleshooting with the Airport card and found that all I would have to do is reset the NV RAM (not the PRAM). Once I did that, it only tries to boot on sys 9 (not even all the way, it just freezes up). Now Disk Warrior says the disk is too severely damaged to rebuild OSX. What would cause this? Any suggestions out there?