Boy do i have a problem for you macrumors to help me with, Lets start from the top: I purchased a Macbook Pro 13" from the apple store in may 2010. Didn't buy apple care. It has worked fine 'til today, got Lion last year, wonderful. Fast forward to this afternoon, I decided to buy Mountain Lion. It downloaded and installed all normally - until it said it was time to restart. It tried, and it wont boot. It wont go past the grey screen with the apple and spinning thing. It just spins to no end. So I took it to the genius bar, and the young lady turned my computer on its side, and ran a test (command+V). She then informed me that i had I/O (input output errors I guess) errors and needed to replace my hard drive entirely($215). naturally, I was like "wth, why did mountain lion crash my hard drive". She told me that I had "overstressed" my hard drive by installing an OS and killed it. Me, suspicious of bs, then booted windows in boot camp and it ran perfectly. then I asked her to explain. She told me the mac partition was the effected area, and it could spread so I needed to buy the new HD soon. This is where I need you help. I need to know if I even need to buy the new HD. apart from those errors it seems fine to me. Cant I just reformat my HD? If it is really broken, how can I try to salvage my files? The fact of the matter is, according to her, Mountain Lion killed my beloved MBP (and im not under warranty or apple care). So would it be worth going after apple? Thanks in advance. I will be refreshing the page like mad waiting for your insight.