The Computer Case

Since the computer case is what you will see every time you use your computer.  Get something that you will find easy to look at.  I like the cases that don't use any screws just slides or clips to keep things in place.

To jump to connecting the case to the motherboard, click here.  To jump to connections on the back of the case click here.

Pictured below is my current case of choice, the Cooler Master #CAC-T05-UW

case backmy computer case

Choosing a computer case

Picking out a computer case is mostly a matter of outside apearance, but I urge you to think about features as well.

Make sure you have enough drive bays for what you are installing.

computer case drive bays

Then I look for cooling.  I like to have at least 2 120mm fans to make sure things stay nice and cool.  The fan pictured below is made by Ultra.

aftermarket case fan

TIP! Some cases will come with a power supply and case fans, others will not.  When looking for a case be sure and read the description to make sure you know what you're getting.


Computer case options vary so you may have more or less connections than I'm showing here.  Just connect them to your motherboard following the manual that came with your motherboard.

This section is broken into two sections, the inside of the computer case, and the connections on the outside of the case.  As always, all images are linked to the original size, click on any image for a larger view.


TIP! Negative is white.  The full color wires are positive.  If there is no white wire, black is the negative.

  • Step 1 - Find the case audio connector if it has one.
case audio connector
  • Step 2 - Find the case firewire, or 1394 connector if it has one.
case firewire connector
  • Step 3 - Find the case USB connector if it has one.
case usb connector
  • Step 4 - Find all of the case connections.  The power led, hard drive led, a power button and a reset switch are the common ones.  You may also have a speaker connection.
case button connector

  • Step 5 - Connect all these wires to your motherboard.  The locations will all be listed in your motherboard manual.  If you don't have the manual, go to the manufacturer's website to find out where they go.
computer case connections
  • Step 6 - Indentify the fan connectors on the motherboard.
motherboard fan connector
  • Step 7 - Connect all the case fans to a fan connector on the motherboard.
case fan connection


To attach the rear connections on a case, let's take a look at the back of your case.  I'll go over all the connections.  Attaching your keyboard, mouse, speakers is much easier now than it used to be.  The color coding is really nice, especially when connecting a surround since all those connections are exactly the same.

computer case backCase is a Cooler Master #CAC-T05-UW 

  • Step 1-  Connect the power wire, make sure the voltage is set correctly as well.  When you've got everything connected, the switch below should be in the 1 position.
computer case power connector
  • Step 2 - Connect the keyboard and mouse.  If you have a USB keyboard and mouse that's fine, just leave these connectors empty.  The purple connection is for the keyboard, the green one is for the mouse.
ps2 mouse and keyboard connection
  • Step 3 - Connect the monitor.  You can connect to either unless one is labelled 1 then connect your monitor to that one first.  It will have better video capability.
dvi monitor connector
  • Step 4 - Connect your speakers and microphone.  Generally, red or pink is the microphone.  If you just have two speakers on your desktop, the green connection is for you speakers.  If you have a surround that uses the same connection as this, just match up the colors.  If they don't have colors, refer to the manual that came with your surround.
computer case analog audio
  • Step 5 - To connect digital audio, use these connections, the round yellow connection is called SPDIF, the other connection is called optical.
digital audio connector
  • Step 6 - USB and LAN connections.  Any USB connection can go into any USB connection on your case, same with LAN connections.  The two connections on the far right are LAN connections.  The four connections on the left are USB.
usb and lan connections
  • Step 7 - Connect a serial device if you have any to the connection below.  Very few electronics use this connection.
serial case connection
  • Step 8 - Devices that move a lot of data, like an external hard drive will plug into either an eSata, or a firewire, sometimes called 1394.  The connection on the left is eSata, the one on the right is firewire.
esata 1394 firewire connector

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