I'm living in China. Was having trouble with my macbook, keyboard stuck on caps, overheating... Nearest Mac store was Hong kong, a night bus away. So, get there on Sat morning, 9am explain that I need to have it by 6pm... to get my bus back. They said no problem. Get it back 6.30... so didn't have a chance to check it, as I was rushing for my bus. Back in China, everythings working great, except... NO AIRPORT CARD INSTALLED! So, they took it apart, and forgot to put it back. I really don't want to have to go all the way back, it's costly, and very time consuming. How difficult is it to replace one of these? I could get them to courier it to me? Can I use a usb wireless adapter for now... or do i need an internal card for these to work?