Dell Vostro 2420 (Mid 2012) - Manual (Page 17)

8. Follow the procedures in After Working Inside Your Computer .
Removing the Power-Button Board
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove:
a) battery
b) keyboard
c) palmrest
3. Peel the power-button board cable from the adhesive affixing it to the palmrest.
4. Flip the palmrest and remove the screw that secures the power-button board to the palmrest.
5. Lift up the power-button board and remove the power-button board cable through the opening.
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