I have the opportunity to buy a second hand late 2010 MBA really cheaply, but has a trackpad and keyboard that don't work. Externally plugged in ones work fine. I'm guessing that no amount of SMC and PRAM resetting is going to help, otherwise he wouldn't be selling it. It's running Mavericks so the latest OS doesn't fix the problem. If I took it into Apple, how much would it cost to repair? Anyone have any ideas?