Dell Vostro 470 (Mid 2012) - Manual (Page 11)

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Removing The Expansion Card
1. Follow the procedures in Before Working Inside Your Computer.
2. Remove the cover.
3. Press down on the blue retainer tab in an outward direction and push the retention panel downwards.
Figure 5.
4. Press down the latch and pull the expansion card away from the computer.
Figure 6.
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