Story: I took my mac out of sleep and found that the trackpad was not functioning. After a little time, I decided just to reboot. I hit the power button and then hit restart, but it could not restart because for some reason, Skype was not closing. Finally, I just decided to force restart by holding power button. I turned computer back on, and it was stuck on the gray loading screen. I waited about 20 minutes and then turned it off. I've reset PRAM, repaired permissions/disk (from Leopard disk). I finally got past the login screen and got on my desktop. When I clicked on the airport on menu bar, I noticed another problem; Airport Card not installed. I rebooted again, reset PRAM, and found I was back in the same situation again; stuck on loading. I checked system profiler and it recognized my airport card, so that is not dead. I decided to finally archive and reinstall OSX. Now I've been stuck on the "about 10 minute" mark for about an hour now. Thinking of just quitting install and trying to reboot again. Honestly don't know what else to do.