I have a 1st gerneration imac g4 (2002), and all of a sudden my sperdrive is making funny noises, and not reading anything (cds and dvds). Is it ready for a new one, or can I save it? Tried disk utility to fix it, but uh-uh. And I can't seem to get any updates for it. If I have to get it replaced, is it $$$ and is it easy to replace?