By SAJJAD SARWAR Saturday 29 October 2011 0 comments

What makes a computer a computer? After all, some furniture stores put 3D cardboard
facsimile computers on computer desks so you can see that the furniture really
will hold a computer. But, what is it about a real computer that makes it
different than the cardboard phony?

Real computers contain a variety of components and subsystems, including

■ Storage devices
■ Motherboards
■ Power supplies
■ Processors/CPUs
■ Memory
■ Display devices
■ Input, multimedia, and biometric devices
■ Adapter cards
■ Ports and cables
■ Cooling systems

This section describes the components of a desktop PC and contrasts the feature of
a desktop with those of a laptop, or notebook, computer. Front and Rear Views of a Desktop PC
Many of these components are visible in the front and rear views of a desktop computer.

Fron View of Normal Tower CPU

Rear View of Normal Tower / Desktop CPU

1. Power supply fan
2. Case fan
3. Empty expansion slot without slot cover
4. Empty expansion slot with slot cover
5. TV tuner card
6. Motherboard diagnostic lights
7. USB port
8. Power supply on/off switch
9. AC power connector
10. PS/2 keyboard port
11. PS/2 mouse port
12. HDMI audio/video port
13. VGA video port
14. DVI-D video port
15. IEEE-1394a (FireWire 400) port
16. Ethernet (RJ-45) port
17. 1/8-inch mini-jack audio port cluster

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