I have an 80GB HD on my macbook and it's currently 75 GB full. My computer will start, but it keeps spinning and it's incredibly slow. So slow, that I can't actually delete anything from it. I attempted to connect my Macbook to a Power Mac via firewire in target mode, which worked - but once I tried to access the Macbook HD - the Power Mac would begin to freeze up and act very slow. Any ideas?