I came home from vacation and my iMac was locked on the screen saver. I held the power button down to turn it off and now it wants me to set up computer again. I tried to repair disk first, but it's says disk utility can't repair this disk. Back up as many files as possible, reformat disk, and restore your backed up files. I am new to Mac and don't know how to back up the files while I am on this screen. I just need to back up some pictures that I recently loaded into iPhoto. Can someone point me in the right direction? Another bad thing is that I never setup time machine. Can I still back up my photos and iTunes account?