IMac G4 hangs at apple logo screen after 10.5.8 update

Hello, thanks for any help you can provide with this problem.
Machine is iMac G4 flat panel. Did an erase and install of Leopard over firewire from iMac G5. Immediately copied 10.5.8 combo update I'd downloaded earlier from the G5 and ran it on the G4. The update completed successfully, albeit slowly, and I clicked restart. After a long wait at blank desktop, machine rebooted on its own. It got as far as the Apple logo screen with spinner spinning, and then it hung. I didn't want to jump to conclusions that it was indeed frozen, so I let it sit there and spin for at least 2 hours. Even for an old G4 this seemed like a bit much, so I forced it to power off and tried again. Still hangs.
At this point I figure something went wrong with the update, so I did another erase and install of virgin Leopard over firewire from the same G5. Repeated update process. It once again completed successfully, I clicked restart, it paused, then rebooted on its own again. To my great dismay, it once again hung at the spinny spinner Apple logo screen.
Now, this is the fourth G4 machine I've done this on in the last week, and the other three are running normally. 1 was another iMac G4, the other 2 were eMac G4's.
Any suggestions?

Interestingly, I brought the G4 into work today and connected it to the G5 with FireWire and turned both on. For some reason (I'm not Mac Pro here, so this might be obvious to some of you) the G5 booted from the G4's HDD and the system started up just fine. I ran repair permissions on the G4's HDD and restarted it. It now boots up fine. Not sure if it was the repairing permissions that fixed it or booting the OS on a different machine. Either way, problem is resolved. Thanks for your input.
Edit: Fixed typo
Message was edited by: armiller76

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    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.

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