Hi all, I have a 2010 MacBook Air. Yesterday, we noticed a hairline crack in the middle. We're not sure how it happened. Nothing dropped on it. No misuse. We never dropped it. It just appeared. I called to get an estimate for replacement. It came back at around $600. Do I have any recourse with Apple? Also, I purchased the computer in December with a Bank of America Visa card. Do you know if they offer any protection, like i've read that AmEx does? Thanks in advance!