How to Disassembling and Assembling a Computer System Unit


Computer Assembling is the process in which all the internal components of the computer system are fitted to make the computer functional.

Computer Disassembling is breaking down the devices of a computer into separate parts.



  1. Turn off the system unit and unplug the AVR (Automatic Voltage Regulator) from the wall socket.
  2. Unplug all the cables connecting to the back of the system unit. After clearing all the connected cables, put the system unit on an empty working table.
  3. Remove the screws of the side cover opposite to the side where the ports are and return the screw to the screw holes to avoid losing them.
  4. Once the side cover is removed turn your system side down where the opened side of the system unit should be facing upward.
  5. Disconnect all wires from the motherboard leading to the power supply, switches hard drives, CD/DVD/Blue-rays/Floppy drives from USB and fan cables, and remove all PCI (Peripheral Components Interconnect), PCI-E (Peripheral Components Interconnect Express), and any removable cords or cables.
  6. Locate the mounting screws for the hard drives and other removable devices and remove them from the computer.
  7. Locate and remove the screw on the power supply on the rear of the computer and the PCI slot covers and remove the power supply from inside the computer.


  1. Locate the screw from the motherboard and remove them carefully, remove the motherboard standoffs as well, then remove the motherboard. Remove all hard drives from the computer, power supply, and lastly motherboard.


Assembling a Computer System Unit

Here are the steps to follow in assembling a computer system unit;


  1. Mount all parts along with the Motherboard, including CPU, CPU’s heat sink, CPU Fan, RAM, and video card.
  2. Install the Motherboard. Tighten the screws mounted to the cases.
  3. Install the PSU (Power Supply Unit).
  4. Install the ODD/CD-ROM
  5. Carefully install the HDD. Tighten the screws mounted to the case.
  6. Connect all the cables to all components inside the system unit.
  7. Put the side cover back and tighten the screws.
  8. Connects all the cables to the system unit.
  9. Test the system unit if it is working well.



Parts and Function

  1. CPU (Central Processing Unit)

The CPU is the brain of the computer and one of the most important chips in the computer.

  1. Heat Sink and CPU Fan

Nearly all computer has heat sinks, which help to keep the CPU cool and prevent it from overheating.

  1. RAM (Random Access Memory)

RAM is the piece of hardware that allows stored data to be accessed randomly. Its main function is to store data temporality.

  1. Video card / Graphics Accelerator card

A video card is commonly known as a graphics accelerator card. This is a hardware component whose main function is to generate and display the output images to a computer monitor.

  1. Motherboard

The motherboard connects and transmits signals to and from peripherals, like your keyboard, mouse, and monitor. The same can be said for your components, such as your CPU, GPU, RAM, and others.

  1. PSU (Power Supply Unit)

A Power Supply Unit or PSU converts mains AC to low voltage regulated DC power for the internal components of a computer.

  1. HDD (Hard Disk Drive)

Hard Disk Drive (HDD) is also known as Hard Drive. This is the computer’s main storage device used to store all data on the computer.

  1. ODD /CD-ROM

CD-ROM is a device that uses photodiodes to detect reflecting lights on optics discs and uses a laser to read or write data.

  1. IDE/SATA connector (Storage Device Connectors)

IDE (Integrated Drive Electronics) Is used to hook up disk drives, floppy disks, and HDDs. These are 40-pin male connectors that connect the HDD.

  1. SATA connector

SATA (Serial Advanced Technology Attachment). Now the SATA connector is the standard connector with a 7-pin interface.

  1. Chassis (The System unit case)

The system unit case serves mainly as a way to physically mount and contain all of the actual components inside the computer, like the motherboard, hard drive, optical drive, floppy disk drive, etc.

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