In order to build your own PC, you will need the following items: ATX case, Motherboard, CPU (if not bundled with motherboard), Memory, Hard drive, Optical Drive (CD/DVD), Power supply (if not included with case). Now you have all these components and are probably wondering how can all these pieces fit together to make a working computer. First, open the side of the case, removed the motherboard from the protective packaging, be carefully handling it. Mount it to the case with the screws supplied with the case or motherboard. Do not screw too tight or you will crack the board. Next if the power supply did not come with the case, this is a good to to install the power supply. Next wire the case to the board (see case motherboard diagram). The Case wires are located near the front of the case and they control the power button, led and front usb ports (if available), and speakers. Next install the processor, make sure you apply enough heat sink between the processor and the board to prevent overheating. Attach the power cable on the processor to the motherboard. Next install memory. If you are only install once strip of memory, make sure you install in the slot labeled one. Next install the Hard drive into the hard drive bay. Connect the IDE (flat gray cable) or Sata (orange-red) to the hard drive and the motherboard. Install the Optical device connect a cabel (IDE or SATA) to the DVD/CD and the board. connect the power wire to the hard drive and optical device. If you purchased extra case fans, then you can install those and connect the power supply. Connect the power supply to the motherboard. Close the case and connect the power cord, keyboard, mouse and speakers (if purchased separately). Turn the unit on, open the optical drive and insert operating system CD, follow the prompts on the screen. When the operating system has finished installing, then you need to run the CD which came with the motherboard and then you have just built your very own PC. Enjoy!