I tried installing Leopard on my iBook G4 and it did not succeed. Now, my computer has a half-installed upgraded OS that doesn't work. I was told at the Apple Store that my computer would run better with Tiger anyway since my processor is not up to snuff to handle Leopard (my iBook is from Jan 2006) and that I should erase the hard disk and re-install Tiger. So now I'm trying to reinstall Tiger but when I insert the disk, start up the computer holding down the C key, the start stalls at the apple logo gray screen with the little cog spinning around. Nothing happens after that. Anyone have any ideas on what to do to remedy this?