hi all. i have an ibook g4 (1.07ghz. os x 10.4.11) and i am getting the blinking question mark folder when i start up the computer. i put in the os x disk that i have, started up with the os x disk and ran disk utilities on it and my internal hd is red under utilities and it says that smart status is failing. when i do "fsck_hfs -r /dev/disk0s3" it runs and says "invalid b-tree node size (4, 0)." i got all these tricks from reading various website on the net, but don't know what to do now. is it gone, or can my hd be salvaged?