Tiger Install Issues on PowerMac G4 AGP (Sawtooth)

hi everyone
i'm facing serious issues with my G4. i got that mac from ebay with install discs for 10.1, 10.2 & 10.3. Finally I got hold of a retail (black disc) version of tiger. every time i try to boot the dvd the mac keeps hanging on the gray screen wirh the apple logo.
things i've tried:
- use an external dvd (Asus sdrw0804P-D) -->no luck
- remove all ram sticks except for one and tried different slots -->no luck
- replaced the hdd -->no luck
- checked several times the firmware version -->no luck
- zapped the pram several times -->no luck
- pressed the cuda switch several times -->no luck
- copied the install disk onto the ned hdd to boot it from there (via disk utility) -->no luck
- copied the install disko onto an external fw400 drive to boot -->no luck (probably my mac doesn't support fw boot)
unfortunately i don't have another mac to try the target mode (would that work from within windows XP?)
i've been using os 10.2 & 10.3 for quite a time now without any problems or freezes. i'm really stuck on this. i need 10.4 for some programms i want to install (e.g. itunes for my ipod 160gb)
what else could i try to get my mac to run tiger?
hardware details:
4x 256 MB PC133 Ram (1x Kingston for apple double sided, 2x infineon single sided, 1x siemens double sided)
1x 10gb original apple hdd ata
1x 80gb samsung spin point
1x ati pci graphics 32 mb
1x original apple dvd-rom
1x apple keyb & mouse
any help would be greatly apreciated
cheers
scottvega

I have a same model G4 PowerMac AGP 400MHz, and low and behold it too does not like Tiger. I've tried installing it to it's hard drive from another machine, even updated it to 10.4.11 from another machine, but then try to boot it itself, I just get the Apple logo and the spinning thing for hours. Firmware has been updated, all of that, it just doesn't like Tiger.
I don't mind Panther, which does run on this machine okay, but I wanted Tiger, especially for it's built in VNC screen sharing functions.
Bizarre.

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