help with g3 mac and os x PLEASE

I have a purple and white g3 mac with mac os 9.1 installed and i want to install mac os x 10.4. I have a disc that came with my new mac that i bought this year. i tried installing it though and when i restarted to install it a really long error message came up and at the bottom it said " Panic: we are hanging here... " Do i need to upgrade my RAM? I really want to get this mac working so any help is appreciated.