hi all. i have an older mac,a G3, running 10.2.8. it was running great. now, all of a sudden, i can't boot up. i tried the C key with the original OSX disk, but it won't boot up with that either. i got it to boot up once with the disk, it couldn't fix the drive because it said it wasn't mounted. since then, grey screen , disk with a question mark. any ideas from anyone would be greatly appreciated.