I have a MacBook - purchased one year ago - and purchased with 3 year warranty (AppleCare). Can not start the computer now - light goes on for a blip - then off and nothing happens. I followed Apples suggestions (resetting memory, etc), but no help. I just brought the computer to the Genius Bar at the Apple Store. They opened it up and said I had "corrosion" on the memory board, and hard drive - and said it was due to liquid. They said it is not covered by warranty, or AppleCare. I am 100% positive that liquid was never spilled - or had any contact with the MacBook - I don't even expose it to outdoors, so rain is not a consideration. Apple said they would have to change everything - and it would cost $800+ - hardly worth it as for a few hundred more, a new machine can be purchased. I'm upset in that the computer is one year old, used sparingly, and I'm absolutely certain that it's never had contact with "liquid". I would appreciate any suggestions on what to do. Thanks.