Dell Precision 490 - Manual (Page 134)

6. Ensure that all connectors are properly cabled and firmly seated.
7. Rotate the hard-drive carrier back into place (see Rotating the Hard-Drive Carrier Back into the Computer ).
8. Replace the computer cover (see Replacing the Computer Cover ).
9. Connect the computer and devices to electrical outlets, and turn them on.
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1 speaker (optional) 4 speaker cable
2 speaker slots with tabs (3) 5 speaker connector on system board
3 latch release tab
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.