If its new building on the computing or have moved away from him for a moment and then you face a daunting task as you choose to build. We addressed this problem in the past for putting together a guide on how to choose a set of PC parts that should help. In summary, this task is time consuming and requires several days or even weeks of research in different parts of the compatibility, performance and price of the course. I can guarantee that a seller does not have all the parts you want. Ok, so all the parts to build just came and sat in a pile ready to make magic. This will be the hardest part for you. Some parts are just going to be expensive, but some parts such as motherboards can cost you. Graphics cards and processors are not cheap either, costing more than 800 if you break something you will do more than you need! Another problem creating the dream team is that you have the space and tools to complete the task? If something goes wrong you can call? Troubleshooting home computer is built very frustrating, not to mention a long time. If something was not right, then you will find yourself having to beg, borrow or buy pieces similar to certain elements of the problem. Try and make sure you have access to parts or be willing to pay again. Another disadvantage is that if a component fails later in the line you can go without a PC work while waiting for a replacement. Building a custom PC has its advantages but you have to expect the worst.