Ok I have a MBP with core 2-duo, 500 GB of hard drive space, and 4GB of ram, running lion. Recently it froze, and then after it froze in safe mode, I had to force shut it down. now it is crashed and won't boot up. The recovery hd says my internal hard drive "Macintosh HD" is not mounted. I believe I have to re-install lion, but first I need to mount Macintosh HD. It won't even start up (the apple loading screen turns into a circle with a line through it), I have to boot into recovery hd (holding down option while booting). Disk Utility says that everything is ok, its just is not mounted, and it won't mount. I do not want to loose my files on this computer, I haven't backed up in a while and will loose important info. Is there anyway to mount my internal hard drive so that I can re-install lion and save my computer? or do I have to wipe everything and reformat my mac? Please help!