Mac mini updated now just get blue screen and a spinning wheel

Mac Mini ppc with tiger.
Updated today (safari, OSX and itunes) after freeing up some space by copying files off to a USB drive. After reboot it gets to a blue screen with a spinning "wheel" and stays there for hours, never gets any further. Will boot to command prompt, target disk mode and a set of DVDs borrowed from work (which won't install as they are for iMac!) but not to anything GUI from the hard disk as far as I can tell atm. Disk utility on the DVDs reports no errors on the internal disk.
All was well before the updates. There was one "funny" but I'm not sure if its relevant. During use today the desktop appeared to get bigger than the screen when changing the screen saver to a snow flake one I used last Christmas (with no problems). As the mouse moves around the screen the screen scrolls in the opposite direction (only about 5 pixels) as used to happen in the old days on my PC when the graphics cards supported higher resolutions than the screen did.
Of course, as luck would have it, I can't find my original tiger disks!
Help!

Safe mode likely won't help, but it is achieved by holding the Shift key down during reboot - press and hold down when you hear the chime. It takes a while longer to boot into safe mode than booting normally, and it loads only core MacOS modules.
One issue that was a perpetual risk with installing updates in versions of MacOS X prior to Leopard was the possibility of disrupting prebinding. Prebinding is the process whereby library files are linked to executables, and problems can occur is applications are running (and in active use) during the installation of updates. If prebinding is disrupted, the system can fail to boot after an update, and the blue screen is a common symptom.
IF prebinding is a problem and you can't boot into safe mode, boot into single user mode (hold Ctrl-S during boot from hearing the chime) and then at the prompt, type 'sudo update_prebinding' (no quotes of course) and hit enter. Enter your admin password when requested, and sit back and wait for the command prompt to reappear, at which point the prebinding update is complete - it could take several minutes.
If that doesn't help, your initial post implies you do not have your original install disks - you may however need them, or a retail MacOS installer, because it may be necessary to perform an archive and install on the hard drive.

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