Dell PowerVault NX3000 - Manual (Page 121)

Installing System Components
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4 Remove all expansion cards from the expansion-card riser. See "Removing
an Expansion Card" on page 119.
5 Press the tab at the bottom of the riser to release the board from the card
slot and lift expansion-card riser 1 off of the mounting pins and out of the
system. See Figure 3-27.
Replacing Expansion-Card Riser 1
NOTE:
The system will not start with a riser board removed.
1 Aligning the pin collar over the mounting pin on the system board, lower
expansion-card riser 1 until the board connector is firmly seated into the
system board socket. See Figure 3-27.
2 Reinstall any expansion cards. See "Installing an Expansion Card."
3 Reconnect all expansion-card cables.
4 Close the system. See "Closing the System."
5 Reconnect your system and peripherals to their electrical outlets, and turn
on the system.