Booting problems after Security update

Hi,
A couple of days ago, I did a Security Update and an update of Safari or Quicktime, I'm not sure. Afterwards, when I started my computer (an iBook G4, 3 years old), it shows the grey Apple-screen and then switches for a second to the blue Mac OS-screen with the bar that should be filling up. However, no filling up happens and a blue screen appears where the mouse-pointer can be seen and moved.
I tried starting up with Safe Boot, but the only thing that happens, is that the spinning wheel on the grey Apple-screen turns quite a while longer. Afterwards the exact same things happen.
I also tried booting from 2 Install Disks, both however not the ones that came with my Mac. (That one I can only get back in a couple of WEEKS.) One of those disks came with an eMac (Mac OS 10.3), the other one with a rather recent MacBook (Mac OS 10.4). In both cases, it won't boot from the disk. With the 'old' one, I get a black screen with mouse-pointer (not moveable) after the grey Apple-screen. With the 'new' one a blue screen appears after the grey Apple-screen.
Can anyone help me?
Tx,
Bas

Did you do a backup before updating? Did you repair permissions before and after, as well as repairing the drive with Disk Utility beforehand?
I know you can't install an OS with a disc that came with another model computer. I'm not sure if it will even let you boot from it, or maybe in some cases and not in others. Have you tried booting in Single User Mode?
[Mac OS X: How to start up in single-user or verbose mode|http://support.apple.com/kb/HT1492]
[Resolve startup issues and perform disk maintenance with Disk Utility and fsck|http://docs.info.apple.com/article.html?artnum=106214]
[Single-User Mode Commands|http://www.westwind.com/reference/OS-X/commandline/single-user.html]

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