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The backup battery connects directly to the logic board. From the symptoms you are describing (rather clearly, thank you), it seems apparent that your logic board may be faulty.
There are two more things you can try.
1) Reset Open Firmware: Unplug-replug your backup battery, then boot the system holding down Control-Option-O-F. Your machine will boot into Open Firmware. Type the following commands, pressing the "return" key at the end of each one:
Your machine should restart at this point. If it starts successfully, you should be done. Otherwise,
2) Reset the Power Manager. Turn the machine all the way off (no power). Simultaneously press Shift-Control-Option-power button, then release. (Do not press the fn (Function) key during this sequence.) Wait five seconds, then press the power button. If it starts successfully, you should be done. Otherwise, you will need to see a man about a logic board, which is probably not a cost-effective repair on a 1GHz G4.
boot in bios and reset the intrusion to read and clear it out alot of times the bios will use its backup when cleared clear the ir setting as weel and remove any passwords in the security setting in the bios if you are using a pov card you may have to take it and reset the machine then disable the card funtion reinstall then reset the card from there