This is hidden prereq.
The handle to open your computer is located on top of the right side panel.
Grab the circular handle and pull outward.
Your computer is now open and ready for repair.
This is your Power Mac G4's video adapter.
Start by removing the screw holding the card to the chassis as shown.
Before lifting the card out, this small plastic tab needs to be pulled back there by releasing it entirely.
With the tab and screw removed, lift the card straight out.