I have an iMac G4 that i picked up from the hamvention, it fires up but it goes kernel panic please turn off your computer screen on startup.

So, i grabbed my OS9.2 disk and its not recognized by the "option" menu.

Then i grabbed my OS10.4 retail disk and itll startup so far and panic saying no driver for this platform PowerMac 4,2 meaning the 10.4.0 retail copy doesnt have the proper kernel for this system.

What is the minimum OS?