Upgraded my iMac from Lion to Mountain Lion and lost most of my files, bookmarks, music, photos, etc. Contacts was about the only thing that made the move. I visited the genius bar where the "genius" shrugged his shoulders and told me "gee, I haven't heard about that happening." Restored imac from time capsule. Installed ML to my MBP and it was flawless. So I decided to give ML another try on my imac. Same result...all files gone except contacts. Restored again. Any ideas.....I'm not fond of the idea of dragging a 27" imac into the apple store.