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Picture of How To Disassemble a Computer
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In this Instructable, I will give a full documentation of how to disassemble a desktop PC, for parts. The specific computer that I will demonstrate with is an HP Media Center PC m7640n with a dead motherboard. Every computer is different, but this is a general guide.

If you don't fully grasp what I mean when I am describing something, please refer to the pictures!

Picture Quality Notice (and HD pics!):

Due to the amount of pictures I uploaded, they are of lowmedium quality. Click the "[i]" in the top left corner of a picture, then click "original file: (3072x2304) 1 MB" to see the high quality HD pictures!
 
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Step 1: Unplugging

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The first thing you do, is unplug every cable that's plugged in to your computer. That includes the following cables:


  • Power
  • USB
  • Firewire
  • Mouse
  • Keyboard
  • Internet
  • Ethernet
  • Modem
  • AM\FM Antenna
  • Cable TV
  • etc...
So pretty much just unplug every cable from your computer.

Step 2: Outer Shell/Casing

Now that your computer is fully unplugged, move your PC to a clean work space, preferably a carpet. The carpet is better than tile, because screws and other small parts will roll around.


NOTICE:
If you are working on a carpet, about every five minuets touch something that is grounded (Sink faucet\pipe, wire coming from the ground part of a wall outlet). This is so you don't shock your motherboard or other parts.

First off, unscrew the four screws on the back of the computer. On most computer cases, there will be large knobs that you can unscrew by hand or by screw driver on the back-right side of the computer. The left side has small screws because on that side you can't access much on the inside.

Once the screws are removed, you can remove the side panels. On most computers, they just slide off. Start with the left side panel (the side that once had the knobs), slide it towards the back of the computer. Now you can remove the left panel. Just like the other one, slide it towards the back of the computer.

Please refer to the pictures if you are confused!

Step 3: Outer Shell/Casing (cont.)

In the last step I removed both side panels. In this step, I will be removing the front and top panels.


Just like the side panels, the top panel slides off. Also like the side panels, the top one slides toward the back of the computer. The front panel clips on to the metal frame with four tabs, so you must push them in and slide the whole panel forward.

Refer to the pictures to see what I mean by "clips".

Step 4: System Fan

Now that the case is off, I will begin to remove the internal components.


Most computers have two fans: the system fan, the one blowing air into the computer, and the CPU fan, the one blowing air onto the CPU heat sink. I will start by removing the system fan first. It is located at the back side of the computer, the side with all the component plugins.

First, unplug the fan from the motherboard. You can find the plug by following the wire from the fan. It should be labeled "SYS_FAN1". Next, you will have to unscrew the fan from the outside. You should now be able to lift the fan out of the PC.

Step 5: CPU Fan

Picture of CPU Fan
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Now that the system fan is out, we can remove the CPU fan.


The CPU fan is located right on top of the CPU heat sink, which is a large piece of metal with fins on the top. The CPU fan plugs into the motherboard in an awkward place, that is hard to access. But just follow the wires and you should easily find it. It is labeled "CPU FAN1". To remove the fan from the heat sink, remove the four screws securing it in place.

Step 6: Power Supply

The power supply manages all the power for the machine.


The power supply is a large metal box located at the upper-back part of the computer. They sometimes come with an on/off switch that is acessable from the back of the computer. The main power cord also plugs into the back of the power supply.

The power supply supplies power to every component in a computer, therefore it has the most wires out of every other component in the computer. The first thing I will do is unplug every wire coming from the power supply. The list below is every thing that I had to disconnect:

  • Motherboard (very large connector/plug)
  • CD/DVD drive[s] power
  • Internal hard drive power
  • Portable hard drive slot power

Once everything is unplugged, unscrew the four screws holding the power supply in place, on the back of the computer. Next, push the power supply from the outside, then lift it out.

Step 7: CD/DVD Drive[s]

I have one CD/DVD drive, but you might have two. If so, follow this step twice!


The CD/DVD drive is one of the easiest components to remove. First, unplug the ribbon from the back of the drive. Once that is completed, pull on the tab securing the drive in place, then push it out from the inside.

If you don't have a second drive, there should be a flat piece of metal covering the drive slot. Follow the inscribed instructions to remove it.

Step 8: Card Reader

Most new computers have built in card readers, but old computers almost never have them.


Just like every other component, unplug the wire first. On my computer, there is just one screw holding the card reader in place. Your computer might have more, so just unscrew them all! After that, the card reader should be removeable.

Most card readers have a protective plastic cover on the part that you can see from the external computer, which can be removed by lifting the tabs on the top and bottom. Refer to the pictures.

Step 9: Hard Drive & Portable Hard Drive Slot

I have included both components together in one step, because in order to remove the hard drive, you must remove the portable hard drive slot first.


First off, de-attach the connector at the back of the slot, and unplug the other end from the motherboard. Also unplug the SATA cable from the motherboard and the hard drive. The portable hard drive slot is secured the same way the CD/DVD drive is, with a tab. Pull on the tab, then slide the slot out.

To remove the hard drive from the side of the slot, unscrew the four screws securing it in place. You must be very careful to not drop the hard drive, as it is very delicate!

Step 10: Expansion Cards

Expansion cards are like small upgrades to your computer.


Expansion cards give a computer new capabilities, once installed. Different examples are:

  • Bluetooth
  • Wireless Internet
  • Ethernet
  • TV

Different computers come stock with different cards. My computer came stock with a TV and Ethernet card. If you only have one, remove that one. If you have two, remove the two!

There should be a single screw on top of each expansion card slot, whether it's occupied, or empty. Remove the screws on the occupied card slots. Once the screws are removed, you should be able to remove the cards by pulling them carefully upward. Some expansion cards have cables leading to other parts of the computer, for example, my TV card is connected to the connectivity center on the front of my computer. You will have to unplug any cables attached to an expansion card.

Step 11: Connectivity Center Cables

Most new computers have a connectivity center located at the front of the computer.


The connectivity center is the area on the front of the computer where there is many input sections, like usb, firewire, microphone, headphones, video, etc.. I won't remove the whole connectivity center in this step, but I will unplug all the cables coming from it.

Do that (unplug all cables), then unplug the wires leading from the power button, hdd light, and power light.

Step 12: RAM (Random Access Memory)

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RAM allows for the near instantaneous transfer of information to and from the CPU.


So pretty much, the more RAM you have, the faster your computer runs. Most computers have 4 RAM slots, and two RAM chips. My computer came stock with two, but yours might have more or less. To remove the RAM, push down on both tabs holding the RAM in place, which are located at both ends of the RAM. Please see the pictures.

Step 13: Power Button & Power LED + HDD LED

The power button, power LED, and hard drive LED are all within a plastic "chasis".


There is a zip tie holding the wires/cables for the front connectivity center and front power button/LEDs. Cut it.

To remove the chasis, press in on the tabs that are located on the chasis' side. Refer to the pictures to see the tabs. Once the tabs are being pressed in, pull the whole chasis out of the computer.

To remove the LEDs from the "chasis", push them from the front with a screw driver. To remove the button, you will need to push it from the back, the side with the wires. For clarification, see the pictures.

Not all computers may be set up like this, so your computer will probably be different. Just use common sense to find a way!

Step 14: Connectivity Center

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Not every computer has a connectivity center, but most new ones do.


Like I said in step 11, "The connectivity center is the area on the front of the computer where there is many input sections, like usb, firewire, microphone, headphones, video, etc.". But this time, I will remove the whole component, not just unplug the cables\wires!

First thing, unscrew the single screw holding it in place. There might be a different amount of screws, in different locations on your computer, but just unscrew them all! One the screw[s] are removed, the whole component should slide into the inside of the computer, which can then be removed.

Just like every other step, refer to the pictures if you are confused!

Step 15: Motherboard

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The motherboard is well, the mother of the computer! It is what links every component in the computer together.


My motherboard is fried, but I will remove it anyway. The motherboard links every component in the computer together. The CPU, RAM, and expansion cards are attached directly to it, and every other part of the computer is in one way or another attached to it.

The motherboard has seven screws holding it to the frame, which are indicated by large white circles around them. Remove those seven, then lift the motherboard out of the frame.

Step 16: Done!

Picture of Done!

This concludes my Instructable "Disassemble a Computer"! In this step, I will give an overview of every component you get out of a computer with a fried motherboard.


Please remember to rate, and ask questions if you find something confusing!

Case:
  • Metal Right Panel
  • Metal Left Panel
  • Plastic Front Panel
  • Plastic Top Panel
  • Metal & Plastic Frame

Hardware:
  • Hard Drive
  • CD/DVD Drive
  • Power Supply
  • Card Reader
  • Expansion Cards
  • RAM Chips
  • Connectivity Center

Cables\Wires:
  • SATA Cable (Hard Drive to Motherboard)
  • Portable HDD Dock and Wires (Power and Data from Portable HDD to Motherboard)
  • Accessory Wire (Connected Card Reader to Motherboard)
  • Drive Ribbon (CD/DVD Drive to Motherboard)

Miscellaneous:
  • 33 Screws
  • Drive Slot Cover
  • 2 Expansion Card Slot Covers
  • Plastic Piece (I refured to it as a "chasis" for a button and LEDs in step 13)
  • Large System Fan
  • Small CPU Fan
  • Portable HDD Slot
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JohnB603 months ago

Thanks so much for your help! You really helped me make my science project at school; this took all my stress away. Thanks a million!

God bless you

jmunden4 months ago

Great job!! It helped me out considerably, I'm not terribly computer savvy but I do enjoy taking anything apart that I can to learn how it works. You said your mother board is fried, is that a Bios code or will the computer just not function? Also my computer is having a continuous beep, its done that before and I manage to push some cables back in and get it to work ,however not this time so I'm wondering if it's the motherboard or CPU..maybe someone can help? Thanks!!

FlemstoneY5 months ago

Fantastic illustrations,I suggest that you may use arrows point at some features in the diagram

bruceb645 months ago

Very good instructional manual. Detailed step by step instructions. I love the Pictures. The only thing I can suggest is that you include a list of tools needed.

ed.lones.96 months ago

great instructions....my hp m7250n is loud and reboots without warning...would like to clean it well and rebuild it. It is 10 years old and I have already replaced the power supply a few years ago. (Could I; Would I; Should I) replace any components or add things to it before I rebuild it?

I noticed that the tv card will not pick up the new digital channels from my over the air antenna; it did when they were analog. Trying to cut the cable (Direct Tv) and use this computer for a DVR in the living room. Is this possible?

Thanks again for the instructions!!

ReCreate6 years ago
It would have been much wiser to buy a new mainboard and replace it...
Arbitror (author)  ReCreate6 years ago
Nah, I got a new super computer. 9GB of RAM! But, I used all of the parts from this computer, and hooked it up to another mainboard I have.

i dont believe you

so how did that work out for ya?

9GB of ram? Run cpuz and put the memory tab, take a screenshot and upload it here, I want to see proof...
Arbitror (author)  ReCreate6 years ago
It won't let me add a pic to the comment... I'll try again later...
upload it to www.willhostforfood.com and link to it.
Arbitror (author)  ReCreate6 years ago
You are aware that any more than 4 GB is invisible to windows...right? Well, I recommend that you dual boot XP and 7, And screw vista. With XP, you would get blazing speeds, in fact, you could turn off the pagefile to get even faster speeds, and with windows 7, i think that there are some features to deal with massive amounts of ram. What is your CPU speed? Take a screenshot of the First tab in CPUZ and upload it...
even better, TRI boot them like i did!!! P.S. I have a forum about this so check it out!!! PLZ
Tri boot them? I was planning on Tri booting Fedora, But my HDD is full now...
I was too, but fedora was stupid and wouldn't let me install it, but I could run it. A tip for clearing space, but try running ccleaner. It freed up 19 gigs if space on my drive. That's the only reason I'm tri booting not dual.
Yeah, Fedora and similar oses don't want to install to their own partition, they want to stay on the same partition XP is not XD I can't imagine how a program could clear 19GB of data, I Can count about 40GB of files that i need and are important, all of the files i have are taking up that space.
i don't know either, but it worked magic on my computer. just try it, and i bet you could clear up at least 2-3 gigs.
I'll try it, Where is it at?
I'd try ccleaner.com, but if you can't find it, I'll post a link.
I just tried it, it cleaned about 120MB of data -_- I simply need a new HDD...stupid tiny 80GB-er
Yeah, I guess that my computer is pretty old... Some guy used it before me and filled it with a bunch of crap. I guess results may vary. ;)
Arbitror (author)  tanmanknex6 years ago
So, where can I check this forum out??
If you can't find it under my profile, then do a search for something like " tri boot xp". It won't come up with anything at first so change the filter to forums. If you still can't find it, tell me and I'll send you a link.
Nevermind, here it is.
That's only in 32 bit versions, isn't it? The ram limit?
Yes, In 64 Bit Versions, Which are Unstable, The limit(i think) is 128TB
Arbitror (author)  Arbitror6 years ago
It runs Vista Ultimate with all of it's effects, smoother and faster than Windows 98, and it's even faster than many Linux distros!
CPUZ, Here is the direct download link.
http://www.cpuid.com/download/cpuz/cpuz_151.zip
And open the memory tab, The tab that is labled memory, and click it...
Arbitror (author)  Arbitror6 years ago
"this computer" as in the disassembled one.
Arbitror (author)  Arbitror6 years ago
Not my new one!
JarrettC16 months ago

thank you for your help. I really needed it.

jlucas153 years ago
Thank you so much for such good info. My computer is shot so I want to remove any important info before I take it to recycling. It won't turn on so I can't use any "wipe-out" software. Thought I'd have to run it over with the lawn mower, but this method is much more civilized.
AceS1 jlucas157 months ago

i find that a sledgehammer is much more effective

Haha! More civilized to the lawn mower.
zahidh19 months ago

this is omar farooq the tuttie man

ompune1 year ago
many thanks 4 the info, as i wish to set up a training school in india for COMPUTER, TV ETC RECYCLING where we will teach unemployed science students this work so they can set up small workshops(1-5 EMPLOYEES) on the city outskirts to take the parts apart & sell the plastic, aluminium,copper & melt the costly metals to be given to big recyclers. also removing the pvc from all electric other than from the computer wires by mechanical means.please let me know the size of the shredder in inches for the mother board. any info u can give on any aspect will be welcome as i am still in the learning stage.
many thanx & awaiting your reply
balbir singh
TimRaquet2 years ago
Thanks for the tutorial. This just happens to be the same computer I needed to take apart.
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