Dell Vostro 2421 (Early 2013) - Manual (Page 33)

d) hard-drive assembly
e) optical-drive assembly
f) keyboard
g) plamrest
h) display assembly
i) display bezel
3. Remove the screws that secure the display hinges to the display panel.
4. Lift the display hinges off the display panel.
Installing the Display Hinges
1. Place the display hinge in its place on the display panel.
2. Tighten the screws to secure the display hinge to the display panel.
3. Install:
a) display bezel
b) display assembly
c) palmrest
d) keyboard
e) optical-drive assembly
f) hard-drive assembly
g) memory module
h) access panel
i) battery
4. Follow the procedures in After Working Inside Your Computer .
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