This has happened with screens, keyboards, missing sleep magnets, bad optical drives. use the apple store, or the forums. If you are truly computer illiterate, use a friend who knows something about how these work in conjunction with Apple's support network. I will explain. Someone came to me yesterday saying best buy told them that they could not do anything to their machine - it was totally fried, the logic board was bad, she should bring it to apple, and that there was nothing they could do. They even gave her the initial deposit that they require before looking at the machine back to her. I turn it on. Within 2 seconds, the clicking noise from the right palmrest indicates the problem. I throw in a drive I had lying around with OSX installed to test, and it primed, it memtested, it went online, and it's back in the hands of a happy user. Anyone here could have diagnosed this issue better than geeksquad. This is the 100th time this has happened to me. I keep a tally in the back of my book, of times best buy has said something will either cost over $600-$1000 when it really cost(including labor) $100-$300, and this was the 100th time. I wouldn't be posting this if it hasn't happened 100 times this very year. I am not sure if they are better outside the midtown Manhattan area. However, here, they fail, bigtime.