i recently came up on an old 500mhz G3 ibook and was looking to sell it on ebay but need it functioning properly first. when i turn it on a lil folder appears with a question mark flashing. my mac sense tells me it needs a fresh copy of either OS 9 or 10, but im not sure how to do this. i tried using the install discs from my powerbook, but the cd rom spat them back out after spinning madly for a few. if i want to re-format, will the discs that came with my powerbook not work?