Dell DL4000 Owner's Manual page 64

c. Pull the mini SAS cable out of the connector on the system board.
a. mini SAS cable connector
c. connector on the system board
6. Disconnect all other cables from the system board.
CAUTION: Take care not to damage the system identification button while removing the
system board from the chassis.
7. Grasp the system-board holder, lift the blue release pin, slide the system board toward the front of
the system, and lift the system board out of the chassis.
CAUTION: Do not lift the system board assembly by grasping a memory module, processor,
or other components.
Figure 30. Removing and installing the system board
1. system board
3. release pin
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b. metal tab
2. system-board holder