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 About Your Computer  
Dell™Dimension™C521ServiceManual 
Front View  
Back View of the Computer  
Back Panel I/O Connectors  
 
Front View  
 
Use this latch to remove the cover. See Removing the Computer Cover. 
Use to identify your computer when you access the Dell Support website 
or call support. 
Can contain an optional floppy drive or optional Media Card Reader. 
The drive light is on when the computer reads data from the CD or DVD 
drive. 
Press to eject a disk from the CD or DVD drive. 
Use the microphone connector to attach a personal computer 
microphone for voice or musical input into a sound or telephony 
program. 
Use the headphone connector to attach headphones and most kinds of 
speakers. 
This light indicates that a LAN (Local Area Network) connection is 
established. 
Use the lights to help you troubleshoot a computer problem based on 
the diagnostic code. For more information, see Diagnostic Lights. 
Use the front USB connectors for devices that you connect occasionally, 
such as joysticks or cameras, or for bootable USB devices. See System 
Setup Options for more information on booting to a USB device.  
It is recommended that you use the back USB connectors for devices 
that typically remain connected, such as printers and keyboards. 
Press to turn on the computer. 
NOTICE: To avoid losing data, do not use the power button to 
turn off the computer. Instead, perform an operating system 
shutdown.
hard-drive 
activity light 
The hard drive activity light is on when the computer reads data from or 
writes data to the hard drive. The light might also be on when a device 
such as a CD player is operating. 
To ensure adequate cooling, do not block any of the vents.