So in the past 6 months, my hard drive has been replaced 3 times on my early 2008 MacBook Air. Unsurprisingly, I just put it in the mail again today with it booting to the question mark folder. I think this is the hard drive again because I could boot from an external drive, but I couldn't access the drive to repair the permissions or reinstall the OS. I have lost faith in this particular machine, and I am afraid my professors are growing weary of the my-computer-just-broke excuse even though I have documentation. How do I approach apple about getting this machine replaced? Also, since I was never planning on getting another MacBook Air, what are the chances that I can convince Apple to give me a credit on a different computer? The Air just wasn't designed for the amount of use I put on it. For the record, I have Apple Care, It is the original MacBook Air (early 2008) with 1.6 GHz processor and the 80 GB drive. Thanks in advance for any help.