First off, make sure you have EVERYTHING you need, if you are missing something, bad things can happen, or it wont work. Heres a basic list of what you would need for a computer. ***=Maintain ground at ALL times to reduce the risk of damange by static shock. » Case with Power Supply » Motherboard w/CPU that is supported » Video Card (AGP/PCI/PCI-E-its a matter of your motherboard) » RAM (the more the better, make sure your motherboard supports the RAM) » Cooling (be it water [experts] or...