Hi. A few days ago, my PowerBook G4 12inch has crashed. i can boot from CDROM and open Disk Utility. It recognizes the hard disk (37.3 GB TOSHIBA MK4025GAS). But when i click on Macintosh HD, it says 'Not mounted'. i click the 'Mount' button but it does not work. First Aid on Macintosh HD stops with an error message 'The underlying task reported failure on exit (-9972)'. i have tried PRAM clear but it did not help. i also tried PMU reset, but in this case, i'm not very certain if i could reset it because i hear no sound or anything. Is there anythink i can do? I would not like to erase the disk content if possible. Many thanks for your help!