A Computer system is a combination of Hardware and Software here we talk about hardware. In hardware main process is computer architecture means that who to connect components of the computer with each other. Main have a Slot for power supply connect their power supply ports and also there two or more slots for Hardisk and CD Rom or DVD Rom of DVDR. And also have there pins for Power on and Off button set their wires for Power On and Off button and Restart System and head lights.