hi all I purchased a second hand MacBook, it was all working fine, good condition etc, I tried to change some details and it said I needed an admin password, I asked my partner (who purchased it for me) to message the guy and get the password, being a man he decided that was too easy and decided he would restore the computer then update it etc. Once he had done that the thing basically crashed. All we can get is the disk utility, we tried to put the lion update on it, it just says it's unavailable right now. The hard drive says it is locked, have tried repairing it etc that doesn't work, the options at the top are greyed out so can't use them! I'm well and truly stuck please someone help me!!!