G4 shut down during the boot!

Hello
I've installed Leopard on my G4 350Mhz upgraded with Gigadesigns 7447 1.6 GHz.
No problem to install Leopard . But after the reboot, i saw the Apple logo and then my sawtooth suddendly switched off.
No problem for rebooting with external firewire drive(Tiger 10.4.10)
Impossible to boot with Leopard!!!!!!
And now impossible to reinstall Tiger without erase all the disk!
Thank's for your help.....

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