Hi, I recently tried to dual boot Ubuntu on my mac osx lion. I'm not sure what went wrong but I currently have Ubuntu running fine but I am unable to boot osx. When I restart my computer I get several options to boot into (Ubuntu, osx 32bit, osx 64bit). When I choose either of the osx a black screen appears and the 64bit has an error sound. I still have all the files from my mac like documents, etc. Can any1 help me get back mac osx? Thanks!