Dell Vostro 3550 (Early 2011) - Manual (Page 60)

8. Lift up the quick-launch button board and remove.
Installing The Quick Launch Button Board
1. Install the quick launch button board.
2. Replace the screw that secures the quick launch button board.
3. Install the palm rest .
4. Install the keyboard .
5. Install the access panel .
6. Install the battery .
7. Follow the procedures in After Working Inside Your Computer .
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