Frankly you need to read and heed the Tip when you post a question. For review:

"Tip: If you are asking for help to troubleshoot a computer-related problem, please be sure to include all the necessary information (ie: operating system, model number, hardware, software, etc) that will help others identify your problem for a speedy resolution."

In your case, nothing about what you have was noted. To many new PC builders they often choke on the fact that today's 2GHz and up wonder boards require 450 Watt power supplies or have orneous cooling requirements.

Inventory what you have, reveal what you are thinking about putting in and the forum can critique it.

Bob