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I have a line through the screen of my iBook G4. Can't get it to go away. Any suggestions?

If I want to maximize performance (and update) my iBook G4, how do I install a new operating system? What can the G4 handle. I'm still using 10.3.9 (I know... very old). I need to update Safari or switch to Firefox. If I install one of them does the old uninstall off my harddrive? And, instead...