Can't re-install the OS X10.2.8 or OS X 10.4.3

I am using a iMac-G4, the original system was OS X10.2.8, then I upgraded to OS X10.4.3 Tiger. Now my G4 is experiencing a preblem: after start-up, when the apple logo and the blue loading-bar disapeared in the screen, the Log-in Box DID NOT SHOW UP, so I can not log-in the computer.
I have tried the following:
1)re-start the G4 by holding down 4 keys and enter command
'reset-vnram' and 'reset-all'. Didn't work.
2)using the Hardware Test disc, the test report shows all passed without error.
I also tried to re-install the OS X10.2.8, or the OS X10.4.3, but both failed---the spinning sign stops moving while the CD or DVD being read by the G4---before the installation instruction shown up. I tried the AppleCare ToolTech Deluxe CD too, same problem as re-installation.
Anyone can give me a help? Thanks.
imac G4   Mac OS X (10.2.x)   was upgraded to OS X 10.4.3
imac G4   Mac OS X (10.2.x)   was upgraded to OS X 10.4.3
imac G4   Mac OS X (10.2.x)   was upgraded to OS X 10.4.3

Hi Quarch,
Let's reset the power manager chip and the startup parameters and check two other things at the same time. Reset the PMU by unplugging the system, removing the bottom access panel, and pressing the PMU reset botton. If you orient the system so the ram slot is to the left, the PMU reset button is on the bottom right of the rectangular exposed area on the logic board, probably under a plastic shield. You don't need to move the shield to press the button. Press the button once only, then wait 10 seconds.
While you have the access panel off, check that your RAM is seated correctly and looks OK. Do the same for the Airport card, if your system has one installed.
Close the access panel and power up your computer. As you boot, hold Option-Apple-P-R (all 4 keys simultaneously) until you hear the startup chime a second time.
With luck, your system will be alive and well. Let us know.
Good luck,
John

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