In today's age, building computers on yourself is often chosen as the safest and choicest option by a sizeable part of the market for computers. There are various advantages and disadvantages for doing so.
When personal computers first entered the mass market, building a computer was an arduous and risky task. Getting the right computer parts was also difficult and without a guarantee. Putting the whole thing together was a risk because of the newness of the product as well as the absence of expert knowledge. But over the years, the market has understood the process of computer assembly and the heavy savings involved in making your own computer (you basically save on the branded company's professional service charge for putting the computer together for you).
Customers are able to find everything needed to build a computer on the Internet. If you want to assemble the whole system at one go, you can get a barebone computer system and keep adding on later. Using quality but cheap computer parts is the key trick behind assembling computers.
There are thousands of cheap computer parts on the web today. A quick check list of the main components you need to build your computer is -
CPUs (Processors)
Hard Drives
Graphics Card
Monitors
CD / CD-RW / DVD ROMs
Mouse and Keyboards (other Input Devices)
Batteries
Cables & Adapters
Communications and Connectivity tools
Cooling Products
Computer Bags & Cases
Firewire Products
Accessories
Digital Cameras
Flash Memory
Gaming Hardware
Ink & Toner
Cellular Accessories
Cleaning Kits & Supplies
Notebook Accessories
Headsets
Media Storage
You can find any of almost all of these computer parts in Internet individually. Cheap computer parts are easy to find and pay for securely over Internet. There are also many sites and services that help you build these types of computers on a professional basis and get you started. These sites help you step-by-step through the process of building a good quality computer using cheap and high quality computer parts - often with illustrated instruction guides to show you how to put your new computer together.