I have a late 2008 intel macbook. Recently I've had issues with the airport card. When I tried to access wifi it would say I had no airport card installed, this could usually be fixed by restarting the computer or doing a hardware test. Today when I tried to turn my macbook on it froze on the gray startup screen, I tried repeatedly to turn it off and back on again, when this didn't work I did the extended hardware test, I did an SMC reset and an NVRAM reset. Still no results, it has no been sitting frozen on this screen for at least 20 minutes. What should I do?