Powermac shutting down after Leopard installation

Hi
I had a perfect system running under Tiger but due to me messing with things I decided to install Leopard. The disk was an upgrade DVD passed on to me by a friend.
The installation went fine but as soon as it restarted at the end the Mac reaches the apple logo and then the whole computer powers down.
I have tried replacing all the components to the original parts e.g graphics and DVD drive but still its giving me problems
Will try archive and install but will I end up losing all my files like music and documents. All I want now is for it to work but I have lost my original Tiger discs and only have my Panther ones, aahhh.
Any ideas in regards to this would be great.
Thanks

Secondly, none of the machines in your profile meet the minimum system specifications for Leopard. It requires 867 Mhz G4 BUILT-IN processor. Upgrade cards are not tested for it, so if you are discussing your AGP PowerMac, consult with the upgrade card manufacturer to make sure there isn't a firmware update for its use. If you are discussing some other Mac, please specify which it is, once you get the Leopard retail.
If you need help restoring your data back to 10.4,11, let us know. It appears you do have two machines capable of Target Disk Mode, which is useful. Just tell us which machine you need help restoring 10.4.11 to.

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