Note; on my iMac G4, I need to remove all screws around the bezel with the exception of the 2 Side Center screws which are holding up the backlit LEDs. Slightly different than your tutorial however this was an excellent tutorial. Just replaced the screen for my daughter all she needs to do is remember her passwords

Note: on my IMac G4, remove ALL screws around the screen with the exception of the 2 side middle screws!!!