My powermac g4 starts up and shuts down immediately after. Why?

I have a Powermac G4 (PowerPC 7455) dual 1.42 GHz, 2x120 GB hard disks, 2x150 GB hard disks, 4x500 GB Ram
I erased all disk and started to install Leopard on one of the 120 GB disk and, during the installation it freezed.
I had to force shutdown and since then it's been impossible to try the Mac Osx install again. Everytime I push the start up button, 1 second after the startup sound it shuts down. Can anyone help me.

Hi, I don't know how fast it shuts down, but...
How to reset the SMU/PMU on a Power Mac earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/ht1379
In fact, do 3 in a row, takes a bit of time.
Does it boot into Open Firmware with CMD+Option+o+f ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)

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My powermac g4 starts up and shuts down immediately after. Why?

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