Disassembling and Assembling the Computer System

Computer System
Computer System | Source

Parts of Computer System

The computer system is made up of following external devices:

  • CPU Cabinet
  • Monitor
  • Keyboard
  • Mouse
  • Printer/scanner [if attached]

switch off the power supply and detach power cable
switch off the power supply and detach power cable | Source
remove the CPU cabinet cover
remove the CPU cabinet cover
detach internal cables
detach internal cables | Source
uninstall internal cards
uninstall internal cards
remove CD/DVD drives
remove CD/DVD drives | Source
remove Hard Disk Drive
remove Hard Disk Drive | Source
remove RAM
remove RAM | Source

Disassembling the computer system

Detach the power cable:

The disassembling of the computer system starts with externally connected device detachment. Make sure the computer system is turned off, if not then successfully shut down the system and then start detaching the external devices from the computer system. It includes removing the power cable from electricity switchboard, then remove the cable from SMPS (switch mode power supply) from the back of the CPU Cabinet. Do not start the disassembling without detaching the power cable from the computer system. Now remove the remaining external devices like keyboard, mouse, monitor, printer or scanner from the back of CPU cabinet.

Remove the Cover:

The standard way of removing tower cases used to be to undo the screws on the back of the case, slide the cover back about an inch and lift it off. The screwdrivers as per the type of screw are required to do the task.

Remove the adapter cards:

Make sure if the card has any cables or wires that might be attached and decide if it would be easier to remove them before or after you remove the card. Remove the screw if any, that holds the card in place. Grab the card by its edges, front and back, and gently rock it lengthwise to release it.

Remove the drives:

Removing drives is easier. There can be possibly three types of drives present in your computer system, Hard disk drive, CD/DVD/Blue-ray drives, floppy disk drives (almost absolute now a day). They usually have a power connector and a data cable attached from the device to a controller card or a connector on the motherboard. CD/DVD/Blue Ray drive may have an analog cable connected to the sound card for direct audio output.

The power may be attached using one of two connectors, a Molex connector or a Berg connector for the drive. The Molex connector may require to be wiggled slightly from side to side and apply gentle pressure outwards. The Berg connector may just pull out or it may have a small tab which has to be lifted with a screwdriver.

Now Pull data cables off from the drive as well as motherboard connector. The hard disk drive and CD/DVD drives have two types of data cables. IDE and SATA cables. The IDE cables need better care while being removed as it may cause the damage to drive connector pins. Gently wiggle the cable sideways and remove it. The SATA cables can be removed easily by pressing the tab and pulling the connector straight back.

Now remove the screws and slide the drive out the back of the bay.

Remove the memory module:

Memory modules are mounted on the motherboard as the chips that can be damaged by manual force if applied improperly. Be careful and handle the chip only by the edges. SIMMs and DIMMs are removed in a different way:

  • SIMM - gently push back the metal tabs while holding the SIMM chips in the socket. Tilt the SIMM chip away from the tabs until a 45% angle. It will now lift out of the socket. Put SIMM in a safe place.
  • DIMM- There are plastic tabs on the end of the DIMM sockets. Press the tabs down and away from the socket. The DIMM will lift slightly. Now grab it by the edges and place it safely. Do not let the chips get dust at all.

remove processor
remove processor
remove the motherboard
remove the motherboard | Source

Remove the power supply:

The power supply is attached into tower cabinet at the top back end of the tower. Make sure the power connector is detached from the switchboard. Start removing the power connector connected to motherboard including CPU fan power connector, cabinet fan, the front panel of cabinet power buttons and all the remaining drives if not detached yet.

Now remove the screws of SMPS from the back of the cabinet and the SMPS can be detached from the tower cabinet.

Remove the motherboard:

Before removing all the connectors from the motherboard, make sure u memorize the connectors for assembling the computer if required, as that may require connecting the connectors at its place. Remove the screws from the back of the motherboard and you will be able to detach it from the cabinet. Now remove the CPU fan from the motherboard. The heat sink will be visible now which can be removed by the pulling the tab upward. Finally, the processor is visible now, which can be removed by the plastic tab which can be pulled back one stretching it side way.

Assembling the computer system

The assembling of the computer system is exactly the opposite of disassembling operation. Before starting assembling the computer system, make sure you have the screws and a screwdriver for those.

The first step for assembling the computer system starts with mounting the processor on the processor socket of the motherboard. To mount the process, you don't need to apply any force. The special ZIF (zero insertion force) sockets are usually used to prevent any damage to the processor pins. Once the processor is mounted, the heat sink will be attached on top of the processor. The CPU fan is also attached on top of the heat sink.

Now the motherboard is to be fixed vertically in the tower case and the screws are fixed from behind of the motherboard.

Now line up the power supply at the top back end of the cabinet and screw it. The power connectors for motherboard power supply and CPU fan power supply are to be connected. If the cabinet cooling FAN is required then it is to be screwed at the back end grill of the cabinet and its power connector is to be connected from SMPS.

Install the CD/DVD drives at the top front end of the cabinet and screw it. Install the Hard disk drive and floppy disk drive below CD/DVD drive and screw it. Make sure once screwed there is no vibration in either of the CD/DVD, Hard disk or Floppy disk drives.

Now select the appropriate data cable and connect one end of the cable to its drive socket and another end at its appropriate connector on the motherboard. For SATA hard disk drive or CD/DVD drives use SATA cable and its power cable, else use IDE data cable. Do the proper jumper settings as per the usage requirement.

It is time now to mount the memory modules on the motherboard by aligning the RAM to its socket on the motherboard and press it downward. Make sure the side tab are fixed into the RAM notch. If not, you may still have to press a bit.

Install the internal cards to its socket and attach the cables or power cable to it. The selection of right socket or slot is required as per the type of socket.

Cover the tower by placing it and pressing towards front side and screw it.

Connect the external devices with CPU at its appropriate socket. It includes mouse and keyboard at PS2 or USB connectors. Monitor at the video output socket. Connect the power cable to the back of tower in SMPS. Plug in the power cable to the electric board.

Comments 47 comments

ariel calapis 2 years ago


renz lazaro 23 months ago

your blogspot is missing something i think it's not complete...!

takiya 22 months ago

let your points be brief and precise

hareesh 15 months ago


ysabel 15 months ago

it's good it can help us in our ict subject.


chandu 15 months ago

it's good, thanks for posting it.

anita 15 months ago

This nice information and very helpfull of students

Aldrin 15 months ago

it helps me to assemble and disassemble a system unit to my computer subject and it makes me good at assembling and disassembling a system unit

joshiparas profile image

joshiparas 15 months ago from rajkot, india Author

you are welcome.

manikanta 14 months ago

it is very helpful for all

bom nic slowdown revil 14 months ago

thank you for posting

Jessel lumen 13 months ago

Thank you for posting

KRISHNA .P.SUTHAR 13 months ago


Evana 12 months ago

Its good and helpful but there is too much text reading

Mani 11 months ago

i like this post :)

Steph Curry 10 months ago

Hmmm .. Something Missing .. i think its not complete very well ..

Rj Galbo 10 months ago

So COooooL !!

aj 10 months ago

even though its not complete, at least you shared your thoughts for students like me

jk 9 months ago

even the all answer is not complete I cannut answer

vanessa 9 months ago

thank you for posting , it help me but the info is incomplete ..

robert saigut 8 months ago

good work

Rosoldier 6 months ago


jauharah badru 6 months ago

thanks for letting us knw coz now at least am perfect in assembling and diassembling a computer sys may God reward u abundantly

Edison Muyala-MALAWI 6 months ago

thank you so much for providing me with such useful has assited me alot in my program of study(bict),i believe i will excell.keep on doing that.

sumanth 5 months ago

digramatic explanation is not good

jamby 5 months ago

its nice thaks for posting

jessica javato 5 months ago

thankyou for posting it! its nice :)

nashria kahar 5 months ago

its so very nice topic. i like it

Jenny Rose Suelan 4 months ago

Thank you so much... effort appreciated much!!

ISAAC LUIS 4 months ago


annah 4 months ago

cute process, like it

Samantha 4 months ago

Very Helpful.

dondon tomas 3 months ago

very helpful.

kyle wincel candido 3 months ago

yot niinay

lorren styles 3 months ago

this really can help for our project..........!

thanks for this

vaibhav kamble 3 months ago

very awesome nd great for our project nd helpful also

The Chosen One 2 months ago


jerik 2 months ago

thanks for impormation

ian 2 months ago

it helps but ... something missing...xDD

silent 2 months ago

its really nice and helpful

thanks author...

ME 7 weeks ago


guru 7 weeks ago

More than enough information

jeff 2 weeks ago

this is a good sighy

rachna rani 2 weeks ago

Thanks for project .....and halfull....thanks auther

alex 2 weeks ago

Nice work, this post helped me understand where to start and how to finish regarding assembling and disassembling a computer.

noelito manalo 12 days ago

ohh nice

Bhanu 9 days ago

Super explanation

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