Darwin/BSD startup error and second level error

Question

I woke up this morning to find the world as I know it in disarray. My G5 was not booting to its normal screen but to the black ominous Darwin/BSD screen.
I researched this awesome forum and found to login as single user mode (cntrl S)
This led me to the root# where i typed /sbin/fsk -fy
The bottom of this read as:
** Checking HFS Plus volume
** Checking Extents Overflow file
** Checking Catalog file.
diskOs9: I/O error.
Invalid key length
(4,260)
** Volume check failed
localhost:/root#
HELP!
Somewhere in the notes from the first time I did this I saw something regarding an autoshutdown and auto startup. Since this G5 is now in my bedroom I do have those features HOWEVER last night I shut down manually (not system generated) if that even matters.

Answer 1

Hi Jim, and a warm welcome to the forums!
It is likely that only DiskWarrior from Alsoft...
http://www.alsoft.com/DiskWarrior/
The CD version is likely to fix it, but you can try fsck repeatedly ubtil no errors occur.
Possibly...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, *you must select your language first.)*
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."