jambo i think it means your HD is full of errors or something. i'm really not the technical type with computers knowledgable with the details, but last nite i had to take my powerbook to a genius bar for a different problem and when i mentioned my battery indicator not showing up the genius said that its a HD related issue.
at the same time he did said that you could copy the files from a friend and it could possibly work again, but the underlying problem would remain and the best thing to do would be to reformat and do a clean reinstall.