Dell OptiPlex 960 (Late 2008) - Manual (Page 11)

About Your Computer
11
Desktop — Back View
1 expansion card slots (4) 2 power supply check button
3 power supply check light 4 cover-release latch and padlock ring
(security screw also an option)
5 security cable slot 6 power connector
7 back-panel connectors
6
2 3 4
5 7
1