For a couple weeks now, I have trouble with my airport connecting. I have to use a PC now (just for internet). The MacBook always has 0 bars and I go everywhere in the house to see if the MacBook's airport will work but it just won't. I think the Airport card has fallen off from the MacBook's logic board like the last iBook G4s problem. I don't have Apple Care and I had this MacBook for nearly 2 years. Please help and thank you.