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3. optical drive (optional)
4. optical drive eject button (optional)
5. USB 3.0 connector (1)
6. drive activity light
7. power button, power light
8. microphone connector
9. headphone connector
10. diagnostic lights (4)
11. USB 2.0 connectors (3)
12. back panel
13. active expansion card slots (6)
14. blank slot (1)
15. security cable slot
16. padlock ring
17. power connector
18. power supply unit (PSU) release
latch
Back Panel
Figure 2. Back Panel View
1. line-out connector
2. network link integrity light
3. network adapter connector
4. network activity light
5. PS2/mouse connector
6. line-in/microphone connector
7. serial connector
8. USB 2.0 connectors (2)
9. PS/2 keyboard connector
10. USB 2.0 connectors (3)
11. USB 3.0 connector
2