i got a white screen when i booted up last night, so i saw it as an opportunity to upgrade rather than trying to fix it. I popped in a fresh copy of snow leopard, it made my white screen boot up. before installing, i opened disk utility and erased my hard drive, and it automatically made a single partition, titled "untitled" and mounted it. i installed to "untitled" and turned install log, and the progress bar is empty. time remaining: about 30 minutes log: checking catalog file is the last line, and it's been there for over 1 hour. i restarted and now it says "volume headers need minor repairs" "repairing volume" and hangs there now. any ideas?