IBook G4 won't boot after 10.5 software update?

Hi,
I have a iBook G4 14" 1.42GHZ 768mb of ram which was running fine under 10.4.11. I updated to OS X 10.5.4 via a retail discs and it installed and re-started perfectly. All seemed ok so i ran software update and the installation seemed to go fine. However upon restarting it all i'm getting is the grey Apple screen & logo along with the spinning flower icon below it? If i boot of the installation disc it won't see the hard drive, just the Mac OS X discs? If i reboot holding the "alt" key it shows the discs as macintosh HD but it still hangs at the Apple logo. Disc Utility will also not see the hard drive. The iBook was working fine before this, is it just coincidence that the hard drive has died?
Any thoughts or advice welcome?
Thanks.

Is it possible that the hard drive was nearly full and installation of Leopard has filled it to the point of disastrous failure? It's generally recommended to keep at least 15% of total hard drive space free for smooth operation.
If this is a possibility, do you have access to another Mac with FireWire or a bootable external FireWire hard drive so you can pull some things off the drive to another location in order to free up some hard drive space?

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Hi Chuper2, and a warm welcome to the forums!
Could be many things, we should start with this, here's the scoop...
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http://docs.info.apple.com/article.html?artnum=107120
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http://www.apple.com/support/downloads/
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willmaciam wrote:
My daughter away at college attempted a software update (10.5.8 Combo). She was also in the middle of loading a software program (matlab).
Welcome to Apple's discussion groups.
Both at once????
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ugly...

Hi thecincykid, and a warm welcome to the forums!
If you have another Mac around, try FW Target Mode, which will turn your iMac into an External Firewire Drive...
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