Stuck on Grey Apple @ Boot After Multiple Attempts

I think I have the iBook G4 from ****.
Let me begin:
Computer is working fine, running 10.4.x (Don't remember). I wanted to install the new iWork '09, which requires the latest version of 10.4, so I run software update.
After software update finishes, and reboots, I'm stuck on the grey apple at boot. No spinning loading circle, don't pass go, don't collect $200. I boot with Ctrl+S and get more info, the same error appears 4 times:
14AppleMacRiscHT is not compatible with its superclass, 11IOPCIBridge superclass changed?
Failed to load extension com.apple.driver.AppleMacRiscPCI.
14AppleMacRiscHT is not compatible with its superclass, 11IOPCIBridge superclass changed?
Failed to load extension com.apple.driver.AppleMacRiscPCI.
Couldn't alloc class "AppleMacRiscAGP"
Couldn't alloc class "AppleMacRiscPCI"
After all these, I get:
ApplePlatformExpert::getGMTTimeOfDay can not provide time of day RTC did not show up
mbinit: done
Security auditiing service present
BSM auditing present
rooting via boot-uuid from /chosen: {Hex String}
Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Then, for eternity:
Still waiting on root device
Booted to OS Install CD, ran Disk Repair, couldn't handle it. Used DiskWarrior with Target Mode and fixed all sorts of problems {PDF: http://bit.ly/encds}. Computer still wouldn't boot, but at least I had files.
I then did an Archive and Install of OS X 10.5, upgrading it from 10.4. The install finished successfully. On the first boot, while downloading updates and, I remember specifically, starting "Little Snitch" in System Preferences, I ran into a Kernel Panic.
Rebooting only left me with the same kernel panic. "Panic: We are hanging here"
Clever Apple, really clever.
I had already made a backup so I decided, screw it. Full format. I did an erase and install of 10.5, it completed successfully and I ran the software update.
Software update failed.
Same. Exact. Error. as the first time.
It appears that a software update is the culprit, leaving the odd kernel panic aside. I'd like to get this to a current state without spending over two hours formatting and downloading the updates on every attempt. I need some help here.
I believe this computer is possessed by the devil. If you believe otherwise, please post.
Message was edited by: epheterson

I have no idea what's going on here, but if you've been using Software Update to update your OS, try downloading the combo update instead from the Apple site and see if this helps. Be sure to verify the disk and repair if necessary, and also repair permissions before and after the download. Be sure that S.M.A.R.T status is verified.
Also, how old is your hard drive? If you still have your original, then it could be reaching the end of its useful life, which is on the average 3-5 years. The stuff that DW found to repair could be resulting from a drive that has started to go south.
If you can, download S.M.A.R.T. Utility:
http://www.versiontracker.com/dyn/moreinfo/macosx/32454
You can download the demo and run it several times for free. It will give you a comprehensive look at the health of your hard drive.
Another good thing to look at is this article:
http://www.thexlab.com/faqs/kernelpanics.html
Good luck!

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New iMac is stuck on grey apple screen after restart from Migration Assistant

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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

After Update to 10.5.8, stuck on Grey Apple screen with turning gear...

After Update to 10.5.8, stuck on Grey Apple screen with turning gear... and it just stays there...
Apparently I can't safe mode it
Started it in verbose mode and it say disk02 i/o error
Then I restarted it in single user mode, did a sbin/fsck -fy and it says that:
*files have been modified*
*REBOOT NOW*
I reboot and still the same problem.
When I put in the install disk it says *cannot install in this drive* (was thinking about archive and reinstall, but I suppose not ) then when I repair and verify, it says All seems OK
Yikes. Yikes!
Please help.
Message was edited for additional clarity by: BrzrKrk

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Stuck on Grey Apple @ Boot After Multiple Attempts

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