Won't boot up after update 10.4.7

Help! I downloaded the update from 10.4.6 (didn't see if it was 10.4.7 but assume it was). Now I start up with a grey screen headed
Panic(cpu 0 caller OX0019CAEF) unresolved kernel trap cpu 0 Type 6=invalid opcode) registers
and on for many more lines which mean nothing to me, but I'll type them in if it will mean something to anyone.
Machine was new in March, and had additional 512mb ram pre-installed. No problems apart from failing to network with G4 and G3 running 9.2, until this download (which indicated it resolved some networking problems).
I've taken out both the original and additional ram, tried it with each on their own, with no difference.
It will restart from installation disk and I've re-set permissions and done a disk check which it errors before completing.
I've done a hardware check which is ok.
I've tried installing a clean system and it errors just before completion.
I've tried to use the Firmware Restoration which is supposed to restore the firmware after an interrupted or failed update - but the LED on my MacBook doesn't flash in the sequence indicated in the instructions and doesn't do the restoration.
It has been suggested by the dealer that I reformat the hard drive, but I have some photos that aren't backed up yet that I really don't want to lose. I've tried starting it in Target disk mode, in order to transfer them to another computer, but 3 other computers I've tried to link it to won't do anything.
I'd be grateful for any guidance!

Have you tried rebooting the machine in safe mode? Restart the machine, and as soon as you hear the chime, hold down the SHIFT key, until you see the grey screen. If it boots, you will see the login screen, and it will say (in red letters) SAFE MODE. This disables a good many of the features such as Airport, but also refrains from loading anything other than Apple kernel extensions. You can then log in, and either attempt to fix your problem, or at least offload your stuff that needs backed up so that you can try a reinstall.
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