Powermac g4 shuts down during start up after installing Leopard and upgrade

I have a powermac g4 (agp), 1ghz, 120gig hd
I successfully installed Leopard. After install the updater came up so I updated the files. I think they were OSX update, quicktime, itunes, and a couple of others I can't recall. I was prompted to restart for updates and when I did it will get to the white screen with the grey apple and spinning wheel then it just shuts off. I have tried to start it up several times and it does the same thing each time. I can't start with the leopard disk since I can't get the dvd drive to open without it running. I've looked at other similar posts on this subject but don't see any that are similar to mine. Any help would be appreciated.

Hi, Claire -
I can't start with the leopard disk since I can't get the dvd drive to open without it running.
Couple of ways to work around that -
• Restart or boot the machine, immediately press the mouse button, keep it held down. This is a hardware command to the Mac to eject all removable media, which should open the drive tray. Insert the disk and close the tray, restart and press the C key.
• Try restarting or booting the machine, then immediately press the Option key (ideally before or simultaneous with the startup chime), keep it held down. This should bring up Startup Manager (a vivid blue screen with a few large icons showing). Once Startup Manager has fully loaded, press Command-. (Command-PeriodKey). This should open the optical drive tray. Insert the Leopard disk and close the tray; wait a bit for the drive to spin up; then click the circular arrow icon on the left. This will cause the machine to rescan the available buses and find the Leopard disk. Once that has displayed, click it to select it and then click the straight arrow icon on the right. It should now boot to that disk.
Article #HT1310 - Startup Manager: How to Select a Startup Volume
powermac G4 (agp/sawtooth), 1ghz....
The fastest G4 (AGP), aka "Sawtooth", machine shipped was 500MHz. If your machine is 1GHz, then it has either had a processor upgrade, or it is a later model. It helps us to know which it actually is. These articles can help you identify it -
Article #58418 - Power Mac G4: How to Differentiate Between Models
Article #42739 - Power Mac G4: How to Differentiate Between Models (part 2)
The fact that it may have an AGP graphics card does not make it a G4 (AGP), or Sawtooth, model - all G4's after the G4 (PCI) model shipped with AGP graphics cards, including the Quicksilver and MDD models.

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