Complete Guide on Building Your Own Computer (Part 2 - Assembly)

Part 2 of my guide on building your own computer. We unbox components and fit everything inside the case to build your own custom PC.

I have been building custom PCs since the 1990s, my first being a 486DX2/66. Here are a few photos of past builds

Now, on to this build, but first, I apologize that when I did my builds, I did not have the foresight to photograph everything fully, but I have been able to use photos from multiple builds for this guide. That is why things appear to change between steps.

The most important thing to remember is that at the end of the day, a CPU is a CPU, and a graphics card is a graphics card. Everything has its place and only fits in its place. Don't force something to fit. Take your time and find out why it doesn't fit. Most things only fit in one type of slot/socket, so does it line up? Is it the right way, or is something else in the way? Building a computer will test your problem-solving skills.

First things first, it's very tempting to take everything out of the boxes and have a look, but I recommend you leave everything in its box and protective bag until needed. This will reduce the likelihood of something happening to damage it.

Dangers of Static Electricity

During the process of building a PC, we are going to be touching sensitive electronic components. We must be very careful about static electricity, which can damage or destroy new components.

Static electricity results from a difference in electrical charge between two surfaces. Have you ever touched a radiator or another person and got a little shock? That is static electricity. This little shock WILL damage computer components.

All components will be delivered in protective anti-static bags and should be kept in the bags until you need them. Once the item has been removed from the bag, if you need to put it down or store it somewhere, put it back inside the bag.

Some people prefer an anti-static strap that attaches to your wrist and has a long cable attached to something grounded - such as a radiator or central heating pipe. I don't like this method, so I use a grounded case method.

While working on a PC, plug the electrical cable into the wall socket and the power supply, but have the power supply turned OFF and the wall socket turned OFF. The power supply switch will be on the back next to the plug. Before touching any internal components, touch a metal part of the computer case with your hand. This will ground you, neutralizing your static charge. You should now be able to work without worrying about static electricity. To be extra careful, touch the case occasionally to keep your static charge neutralized and ensure you remain grounded.

Building Your Own Computer

The first thing you need to do is locate an area with plenty of room to work. A dining table or large desk is ideal. Using a tablecloth or hobby mat is a good idea to prevent any scratches on the table.

Coffee is optional when building your computer. I'd advise against having coffee or any other drink around the same desk in case of spillage.

Now, unbox the case and remove the packaging and side panels. Locate the box of screws, cables and the instructions. Do the same for the Power Supply. This is going to be the first part to be fitted.

There will be a large opening on the back of the case, which is just a little bit smaller than the power supply. The supply should fit inside the case with the fan exhaust and plug facing out the large case hole. The case instructions will tell you the exact placement, and you should screw it in according to those instructions.

You can now plug an electrical cable into the PSU and the wall socket, ensuring that the wall socket and the PSU are switched OFF. The case is now grounded, and you will be grounded every time you touch the bare metal in the case (usually grey). Always do this before handling components and removing them from the bag.

Fitting the Motherboard inside the Case

The motherboard is the largest of the components and the first to be fitted. Before you take it out of the bag, we need to screw in some spacers to the case. The position varies by form factor; your manual should show you the layout. You can also look at the motherboard and see where the holes are and line it up with the screw holes on the case. Once the spacers are tightly fastened, you can take the motherboard out of the bag and lay it onto the spacers, taking care to line up the ports with the holes in the rear of the case. You can now screw the motherboard into place.

Now is a good time to connect the case lights and switches as there is nothing in the way. Some cases have many wires with individual plugs, while others have a complete connector. Check the motherboard manual for where each cable is plugged into and they are generally labelled on the motherboard and close together.

You can also plug in the case fan and connect the PSU to the motherboard via the very large block connector.

Fitting the CPU into the Motherboard Socket

Once the motherboard is secured into the case, locate the large CPU socket. It is usually a large square or rectangle with hundreds of tiny holes. It usually has a little lever next to it. You should check the instructions for the motherboard on the exact procedure, but essentially, it goes like this. Always hold the CPU by the edges, NEVER touch the pins and avoid touching the top shiny surface.

One corner of the socket will be marked with a raised or lowered dot or sometimes a triangle. Note the position. Lift the lever to the up position. Now ground yourself and carefully remove the CPU from its packaging, taking care NOT to touch the pins. Inspect the top of the chip and locate the marker dot/arrow. Line up the markers on the socket and processor and gently insert the CPU into the socket. It should gently fall into place. Now lower the lever and secure it. This is a zero insertion force socket.

Now, you need to fit the heatsink and fan assembly. This process generally involves gently placing the heatsink on top of the chip and securing the bracket over the CPU and into the socket. Please check the instructions for the processor for this exact process, as it does vary between chips and manufacturers. Don't forget to connect the fan to the CPU fan connector on the motherboard.

Fitting the Graphics Card into the Motherboard

Now the most difficult part has been completed, we can install some of the smaller and easier components. The first is the graphics card. Use your motherboard manual to locate the appropriate slot, either an AGP or PCIe slot, depending on the type of graphics card you bought. Remove one of the back panel blanks in line with the slot and gently lower the graphics card into the slot. You may have to push gently, but it's not stiff or hard to press, so don't force it.

Depending on the graphics card specification, you may need to plug in one or two power cables. There should be a couple from the PSU that you can plug in here.

Fitting the Hard Drives / SSD And Wiring Them Up

Storage devices usually sit in a cradle or caddy within the case. Some are screwless, in which case there is a plastic bracket that clips to the drive, other you have to line up the holes in the case with the holes in the drive and screw them in. The plugs face towards the inside of the case, and the label is up (the drive control circuit board is on the bottom).

You can then take a SATA connector from the PSU and connect it to the drive(s) and a SATA cable, sometimes supplied with the drive and motherboard and connect it to the drive and motherboard.

Power On For The First Time

Most things should be wired up inside now, so now have a check around and make sure that everything is seated properly in its socket, with no loose screws. Next, we need to connect a monitor and a keyboard. Keep the case lid off; we need to see inside and ensure everything works. Be sure not to touch anything whilst it is running. Next, turn the wall socket on. In theory, nothing will happen, which is a good sign. Next, turn on the PSU using the rocker switch at the back by the power cable. You should see some lights come on the motherboard. Don't panic if you don't. Not every motherboard has these lights, but most do.

Make sure that the monitor and keyboard are connected and powered up. Now, it's time to turn on for the first time. You should see and hear activity. Firstly, check that the CPU fan has started up, then check that the case fans are spinning. You can hear a hard drive spin up, but not an SSD.

You should also hear a single beep and see some activity on the monitor similar to this picture. Different motherboards have different screens so that yours may be different. If you hear a series of beeps, then something probably isn't connected. Turn everything off and check to ensure all the connectors, power cables, and any clips on the RAM are closed. If you still get beeps, you can look up the BIOS Error Beep Code or refer to the manual, which will help diagnose the problem.

In this example, I did not have any drives plugged in, but if yours are plugged in and working, they will be listed on this screen.

If everything goes well, you should see an error like "Operating System Not Found".

Installing Operating Systems

The final step you need to perform is installing an operating system. There are many to choose from, the most popular being Windows or a Linux distribution. These are outside the scope of this article, but I have further articles which you may be interested in.