Dell Dimension 4500 - Manual (Page 57)

USB 2.0 Connectors
For quick connections, Dell recommends using the front USB connectors for USB devices such as digital cameras, gaming controllers, and scanners. Use the
back-panel USB connectors for USB devices that are seldom disconnected, such as USB mouse and keyboard devices.
Headphone Connector
Use the headphone connector to attach headphones and most speakers for listening to all sounds from your computer, including your CD player and computer
sounds such as beeps.
Service Tag
This label lists your computer's service tag and your Express Service Code (if applicable). If you call Dell technical support, use your Express Service Code to
route the call directly to the correct support personnel. The Dell technical support staff will ask for your service tag information.
Back View
Power Connector
Plug one end of your computer power cable into the power connector, and plug the other end into an electrical outlet.
Voltage Selection Switch
The voltage selection switch must be set to match the AC power available at your location. The switch should be set for 115 V in most of North and South
America and some Far Eastern countries such as Japan, South Korea, and Taiwan. For most of Europe, the Middle East, and the Far East, the switch should be
NOTICE: This computer supports the use of a USB hub. However, do not connect two or more USB hubs to a USB connector. Doing so may cause the
computer to unexpectedly reboot.
HINT: If you attach a USB device that was not included in your original computer order, you may need to install a specific driver to make the device
work. Check the documentation that came with the device or contact the USB device manufacturer for more information.
HINT: Express Service may not be available in some countries.