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1. Reset Switch: Immediately hard-restarts system. Last resort only, as it will lose unsaved data and may corrupt OS.
   
2. HDD LED: Light that turns on when there is drive activity.
   
3. Power Switch: On/off button. When system is on, sends a shutdown signal to the OS. Holding it will force shutdown.
   
4. Power LED: Light that is on while the system is powered on. May flash when the system is in standby / sleep.
   
5. External SATA Port: External SATA (eSATA) port for connecting to drives directly via SATA rather than USB or Firewire.
   
6. USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices.
   
7. Front Microphone Jack: 3.5mm analog audio jack for microphone input to the computer.
   
8. Front Headphone Jack: 3.5mm analog audio jack for output to headphones.
   
9. USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices.