Dell Vostro 3750 (Early 2011) - Manual (Page 120)

17. Remove the I/O panel from the bottom base.
Installing The Input/Output (I/O) Panel
1. Tighten the screw that secure the I/O panel.
2. Install the
system board .
3. Install the ExpressCard cable .
4. Install the system fan .
5. Install the display assembly .
6. Install the WLAN card .
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