Step 1:
Turn off your iMac G5
Step 2:
Power it back on. Right when you hear the startup sound, hold down Command and S together. This will bring up a black and white terminal prompt.
Step 3:
If at this point, it asks for a password (firmware password), power back down the iMac, change the amount of RAM (remove one stick of RAM and leave the other in), turn the computer back on and when you hear the start up sound hold down Command + Option + P + R. Keep holding until it restarts again. Once it restarts again, let it boot up, then shut it down again and put the stick of RAM back in. This will reset the firmware password and should allow you to continue onto the next step.
Step 4:
Once you are successfully at the command prompt, type the following commands, pressing enter after each line.
mount -uw /
rm /var/db/.AppleSetupDone
shutdown -h now
Step 5:
That's it! Once you boot back up, you should have a brand new administrator account that you can use to access all files and remove other accounts.
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