Gateway 7400 System Manual page 90

10
Loosen the retaining thumbscrew securing the board support tray to the
right side of the chassis.
Retaining
thumbscrew
11
Slide the board support tray toward the front of the chassis slightly to
disengage it from the stand-off retention hooks.
12
Using the handle at the bottom of the board support tray, pull the back
edge of the system board (the edge against the back panel) out of the
chassis.
82
Replacing and Adding System Components