STEP-BY-STEP PROCESS OF DISASSEMBLING AND ASSEMBLING OF SYSTEM UNIT
Note: It is a requirement when disassembling a computer to ensure that there is no electricity flowing through the system unit. To drain the flea power (static electricity), disconnect every cable from the system unit and press and hold the power button for 20 seconds. Then, release the button.
Tools that are needed:
Philip's head screwdriver
Antistatic wrist-strap
DISASSEMBLING
Use an antistatic wrist-strap to prevent electrostatic discharge (ESD) which can be deadly to computer electronics. Alternatively, touch a large metal body like a radiator to discharge yourself.
Unscrew the side panel (or slide it toward the back of the case) to do so.
Note: Please remember where all components are attached before disassembling.
Unscrew HDD on the case then unplug the power and SATA cable.
Unplug all the cables you can see connected to the motherboard such as SATA cable, 24 pins cable, audio cable, USB cable, HDD LED cable, and power and reset button switch cable.
Note: 24 pins cable is the cable that supplies power from PSU to the motherboard. Audio cable and USB cable are connected to the front panel.
To safely remove the RAM simply push the clip downward towards the motherboard. Be very gentle when you do this and it should push the RAM module up while the clip opens up. After that, you can remove the RAM by gently pulling it upwards on both sides.
To safely remove the graphics card from motherboard, remove power supply cables most graphics card cables are connected to six-pin and eight-pin PCI-e cable, PCI-e cables have a tiny lever underneath that you need to pull down and push out gently until it comes off. Remove these cables and other dedicated cables that connect the graphics card to the other components. Unscrew the graphics card from the case then gently pull on the expansion slot lever to unlock the card from the slot, slide the card out of the graphics slot, and remove it from the motherboard.
Gently remove the heatsink cable from the motherboard and cable from PSU if present then unscrews all the screws to remove the fan of the CPU.
Note: HSF is used to prevent overheating of the CPU.
First press down the lever and slightly pull it towards right and pull the socket of the CPU then be careful while removing the CPU because it is too sensitive, hold it on both sides to remove, then gently wipe the thermal paste carefully and thoroughly.
Unscrew PSU from the case and gently pull it to remove.
Note: The purpose of the power supply is to regulate power all throughout the whole device.
Unscrew the motherboard from the case and make sure that there is no cable connected left. Then, you are done disassembling.
ASSEMBLING
Use an antistatic wrist-strap to prevent electrostatic discharge (ESD) which can be deadly to computer electronics. Alternatively, touch a large metal body like a radiator to discharge yourself.
Unscrew the side panel (or slide it toward the back of the case) to do so.
The power supply will usually go near the top or the bottom rear of the case. You can determine where the power supply is supposed to sit by looking for a missing section on the back of the case.
This is usually easiest to do before you install the motherboard, as the case can limit your ability to wire components:
Attach the processor to the motherboard by finding the processor port on the motherboard's surface. There is a small, golden triangle on the corner of every CPU, which must be matched with a similar triangle on your motherboard.
Attach your RAM to the motherboard by finding the RAM slots and inserting the RAM appropriately (they should only fit one way).
Attach your power supply to the motherboard's power connectors.
Locate (but do not attach) the motherboard's hard drive SATA port. You'll use this to connect the hard drive to the motherboard later.
Put a small dot (around the size of a grain of rice or pea) of thermal paste on the CPU. Adding too much thermal paste will create a mess, such as getting paste into the motherboard socket, which may short-circuit components and decrease the motherboard's value if you plan to sell it later
Note: Some processors that come with heat sinks do not need thermal paste because the heat sink already has thermal paste applied by the factory. Check the bottom of the heat sink unit before applying paste to the processor.
This varies from cooler to cooler, so read the instructions for your processor.
Most stock coolers attach directly over the processor and screw into the motherboard.
Aftermarket coolers may have brackets that need to be attached underneath the motherboard.
You may need to knock the plates out of the back of the case in order to fit your components into the correct positions.
If your case has separate shelving units to hold your hard drive, install the units using the included screws.
You may need to install and wire your case's fans before you can install any components. If so, follow your case's fan installation instructions.
Once the standoffs are installed, place the motherboard in the case and push it up against the backplate. All of the back ports should fit into the holes in the I/O backplate.
Use the screws provided to secure the motherboard to the standoffs through the shielded screw holes on the motherboard.
These tend to be located together on the motherboard near the front of the case. The order in which these are connected will depend on which is easiest. Make sure that you connect the USB ports, the Power and Reset switches, the LED power and hard drive lights, and the audio cable. Your motherboard’s documentation will show you where on your motherboard these connectors attach
There is typically only one way that these connectors can attach to the motherboard. Don’t try to force anything to fit.
The pins of these connectors are often very thin and delicate, so take extreme care not to bend or break any.
This process will vary slightly depending on your case, but should typically go as follows
Remove any front panels on the case (if you're installing an optical drive, you will usually install it near the top of the case).
Insert the hard drive into its slot (again, usually near the top of the case).
Tighten any screws needed to hold the drive in place.
Plug the drive's SATA cable into the SATA slot on the motherboard.
If you're using an M.2 SSD, you'll need to slot this into the motherboard, and screw it down to the small post on the end opposite to the slot. Many motherboards have heatsinks over M.2 slots, so make sure you remove any plastic backing after installing your drive and replacing the heatsink.
If you haven't already connected the power supply to components which need power, make sure that it is connected to the following locations:
Motherboard. This is connected with the largest plug: a (usually) 24 pin connector.
Graphics card(s). These draw 75W of power from the PCIe slot on the motherboard, but may require additional power in the form of 6 or 8 pin connectors on the card.
Storage devices. These connect with SATA cables to both the power supply and motherboard.
Once you've placed and connected the various internal components for your computer, all that's left to do is ensure that none of the wires interfere with circulation and close up the case.
Many cases will have a panel which either slides back into place or screws onto the side of the case.
You may first have to attach the power cable to the power source input on the back of your case.
Plug the monitor and other peripherals.
Proceed to OS installation.
