Mac OS X will not start

I cannot start my Powerbook G4 1.67GHz.  I just get to the startup screen (Apple logo) with a spinning progress indicator.  I've tried booting from the install CD and running Disk Utility.  It reports "Getting disk information..." with yet another eternally spinning progress indicator.  I'm trying to boot into single-user mode to run fsck and am getting the following output:

standard timeslicing quantum is 10000us
vm_page_bootstrap: 253319 free pages
mig_table_max_displ = 70
112 prelinked modules
Copyright (c) 1982, 1986, 1989, 1991, 1993
                   The Regents of the University of California.  All rights reserved.

using 2621 buffer headers and 2621 cluster IO buffer headers
IOPCCard info:  Intel PCIC probe:  TI 1510 rev 00
FireWire (OHCI) Apple ID 31 built-in now active, GUID 001124ff fe411cbc; max speed s800
CSRHIDTransitionDriver::probe -s
CSRHIDTransitionDriver::probe booting in single user .. do not match
Security auditing service present
BSM auditing present
disabled
rooting via boot-uuid from /chosen: 44B07742-5E8E-359C-A566-CAA8B143A81
Waiting on <dict ID="0"><key><IOProviderClass</key><string ID="1">IOREsources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
kStorageDriver/ST9100823A Media/IOApplePartitionScheme/Untitled@3
BSD root: disk0s3, major 14, minor 2
jnl: replay_journal: from 1265664 to: 7557632 (joffset 0x8601000)
disk0s3: I/O error.
jnl: update_fs_block: error reading fs block # 40168! (ret 5)
disk0s3: I/O error.

I never am given the opportunity to enter commands.  It simply updates the screen every two minutes or so with a new version of the last message, incrementing the number after "fs block #" with each new iteration.  What should I do!?!
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