Dell Precision 690 - Manual (Page 118)

14. Insert the riser cards into the connectors until both riser cards snap into position.
15. Connect the power cables to memory riser cards 1 and 2.
16. Replace the memory shroud. Tighten the thumbscrews until the memory shroud is well secured and will not shift when the computer is moved.
17. Replace the computer cover (see Replacing the Computer Cover ).
18. Connect your computer and devices to electrical outlets, and turn them on.
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NOTE: If a memory-riser power cable is not plugged in, the system will not boot.
NOTICE: The memory shroud holds the (optional) memory risers in place; its thumbscrews must be sufficiently tight in order to secure the risers and to
avoid damage.
1 memory shroud
2 thumbscrews (2)
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.