IBook not starting Mac OS

Hi, recently a customer bring me an iBook G4 12, the mac didnt start the MAc OS X.
The problem is this:
When the iBook starts it stays a lot in the Apple logo and round loading circle... afeter 10 or more minutes change to a blue screen without any on screen, finally after 10 or more minutes it change to the same blue screen but with the mouse pointer on it, whe I can move the mouse but no more else.
1. I dont have de software.
2. After trying the key SHIFT after the sound scheme y shutdowns after some minutes.
3. If I enter in single user (Apple key + S) and try some commands appears the next:
"/sbin/fsck -fy"
**/dev/rdisk0s3
**Root file system
**Checking HFS Plus volume
**Checking Extens Overflow file
**Checking Catalog file
Invalid node structure
(4, 1152)
**Volume check failed
4. If I try to mount the drive, it also sends an error:
"strategy err 0x5"
"I/O error"
5. If i put logout the ibook try to start but stops as the same problem, blue screen with mouse movement.
Thanks.

Hi there!
Sounds like the hard disk drive may be bad, or have bad sectors or file structures.
Perhaps a bootable disk tool (or the OS X installer which is bootable and has a
disk utility on it) would be necessary to hope to fix the errors on the drive; or to
be able to further study the problem to see if the hard disk drive may have failed.
Since the hard disk drives in iBook G4s are not so easy to exchange with a new
replacement, though that probably is a necessity, some users try to check and
repair the internal drive before replacing it. A tool such as Disk Warrior is helpful.
And any supported retail version of OS X the machine can use, in appropriate
disc media, should be able to start the computer (hold C on start) and be able to
use the Installer's Disk Utility to repair disk. That may not be enough; but you
can also verify disk to see if it passes the SMART test. Sometimes these do,
but still have issues requiring eventual replacement if they are well-used iBooks.
If you have a second Mac running OS X, you could see if the portable in question
could boot into FireWire Target Disk Mode, and then be seen as an external HDD.
With a FireWire cable, you may be able to see if the iBook's drive could be repaired
from a Disk Utility version in a host computer, so attached. (Use FW 6-pin to 6-pin.)
I have not tried this; so you may wish to check out the Support page for Target Disk
Mode, and other reading to see if there is a problem with this idea!
Good luck & happy computing!

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