Back panel
Connect USB, audio, video, and other devices.
Expansion-card slots
Provide access to ports on any installed PCI Express cards.
Power port
Connect a power cable to provide power to your computer.
Power-supply diagnostics light
Indicates the power-supply state.
Padlock rings
Attach a standard padlock to prevent unauthorized access to the interior of your computer.
Security-cable slot (wedge-shaped)
Connect a security cable to prevent unauthorized movement of your computer.