Leopard Upgrade G4 now shuts down on startup

Just upgraded my G4 450 Mhz to 1.0 Mhz and added new hard drive.
Installed 10.4 on new drive. Worked fine.
Upgraded 10.4 to 10.5. Now on startup I get the apple logo, then the computer shuts off.
Computer still works fine if I launch from CD or from original drive with 10.3.
Going back to 10.4 for now but very disappointed that I can't use Leopard. Any ideas?
Thanks in advance.

I had a similar issue when upgrading. I sorted it by reformatting the hard drive and doing a clean install of Leopard (or just a simple 'erase and install'). Works fine now. Apparently it's something to do with Leopard not liking the disk drivers used by older versions in certain cases.
Obviously make a backup of everything on the hard drive before doing the erase and install!

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