PowerPC G4 powers down on reboot after installing Leopard 10.5

After what seemed like a successful install of Leopard 10.5 from Tiger 10.4.11 (got the green check mark and successful install message at the end), upon reboot, my PowerPC G4 went to the gray screen - but before the gray apple appeared, the system completely powered itself down. I didn't get any other messages about firmware updates during the install process.
Does anyone know why this might happen?
PowerPC G4 (AGP graphics) 1.4 GHz, 2MB L3 cache
768 MB ram, 128 GB hard disk, Samsung DVD-RW drive

So, it is possible to upgrade OS from a Power PC G4 10.4.11 to Leopard 10.5?
Yes, as long as your G4 meets the Leopard 10.5 specs:
- Mac computer with an Intel, PowerPC G5, or Power PC G4 (867 MHz or faster) processor
- 512 MB memory or more
- A DVD drive for installation
- 9 GB of available disk space or more

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