I am on a 900mhz iBook running 10.2.8. My airport card seems to be having some issues, and I am having some problems with troubleshooting. Starting Friday night, I noticed my internet blinking (via my airport wireless card). I checked the router, no problems with the router. Also, my roommate's wifi connection is running flawlessly, so it's not a router level problem. I can connect fine via my ethernet port, so i don't think my ISP has mistakenly blocked me. My airport settings are normal; cable modem, using dhcp, etc. The card can see my router and it's name, and shows full signal. But no internet comes in. Also, I cleared my router logs after resetting it and it did not show my computer under the connection logs. Finally, I tried going into the airport utility and scanning for my router, which it found, and having it "join" my network. The first time it worked, but only for about 5 minutes, then the network blinked out again. Since then it hasn't worked. I repaired permissions and ran the macjanitor scripts. I even rebooted! Any other troubleshooting suggestions, or should I just bite the bullet and head over to my local apple store for a genius consult?