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  1. Power Switch: On/off button. When system is on, sends a shutdown signal to the OS. Holding it will force shutdown.
  2. Power LED: Light that is on while the system is powered on. May flash when the system is in standby / sleep.
  3. HDD LED: Light that turns on when there is drive activity.
  4. Front Headphone Jack: 3.5mm analog audio jack for output to headphones.
  5. Front Microphone Jack: 3.5mm analog audio jack for microphone input to the computer.
  6. USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices.