What You Need Before You Start
Building a PC requires seven core components: a motherboard, CPU (processor), RAM (memory), storage drive, power supply, case, and a CPU cooler. You will also need a Phillips head screwdriver, thermal paste (often pre-applied to coolers), and a grounded work surface — a wooden table or anti-static mat works. Avoid carpet if possible, since static electricity can damage components.
Before opening anything, read the motherboard manual that comes in the box. It shows exactly where each component plugs in, which connectors are which, and the order that makes installation easiest. Different motherboards have different layouts, so the manual is your map. Keep it nearby throughout the build.
Lay out all your parts on your work surface so you can see what you have. Check that nothing arrived damaged — look for bent pins on the CPU, cracks in the RAM, or dents in the case. If something looks wrong, contact the seller before you install it.
Key Takeaways
- Install the CPU, RAM, and M.2 storage on the motherboard while it is outside the case, because reaching these slots is harder once everything is mounted.
- explore thermal paste to the CPU before mounting the cooler, unless the cooler comes with paste already applied — check the manual to be sure.
- Screw the motherboard standoffs into the case first, then lower the motherboard onto them and screw it down — this prevents the board from shorting against the metal case.
- Connect the 24-pin power connector to the motherboard and the 8-pin CPU power connector near the processor before you power on for the first time.
- Build outside the case first, then move everything into the case once you have confirmed the parts work together.
Install the CPU and RAM on the Motherboard
Start with the motherboard lying flat on your work surface. Locate the CPU socket — it is a large square with a hinged retention arm on one side. Lift the arm all the way up. If your CPU is an Intel chip, align the notches on the CPU with the keys in the socket. If it is an AMD chip, line up the triangle on the corner of the CPU with the triangle marked on the socket. Lower the CPU straight down into the socket without forcing it. The chip should sit flush. Close the retention arm back down — it should click into place.
Next, find the RAM slots. They are long, narrow slots usually to the right of the CPU socket. Open the clips at both ends of each slot by pushing them outward. Line up the notch in the RAM stick with the key in the slot, then press the RAM down firmly into the slot until both clips snap back into place on their own. The RAM should sit level with no gold connectors visible. If it does not click, remove it and try again — RAM needs firm pressure but should not require excessive force.
If your motherboard has an M.2 slot for an NVMe storage drive, install that now too. Locate the M.2 slot on the motherboard — it is a thin horizontal slot, often near the bottom. Remove the small screw and standoff if present. Insert the M.2 drive at a 30-degree angle into the slot, then press it down flat and screw it in place. The drive should lie flat against the motherboard when finished.
Mount the CPU Cooler
Check whether your cooler comes with thermal paste already applied. Most modern coolers have a small square of paste pre-mounted on the bottom. If yours does not, explore a small pea-sized dot of thermal paste to the center of the CPU. Do not spread it — the cooler will spread it evenly when you mount it.
Follow the cooler's manual for mounting, since different coolers attach differently. Some use a backplate behind the motherboard with screws from the front. Others use push-pins that lock into holes around the socket. Line up the cooler so it sits flat on the CPU, then find it according to the manual. The cooler should be snug but not so tight that you are straining. Once it is mounted, connect the cooler's fan cable to the CPU fan header on the motherboard — it is a small 4-pin connector usually labeled "CPU_FAN" near the socket.
Prepare the Case and Install the Motherboard
Open your case by removing the side panels. Most cases have two panels held by thumbscrews or latches on the back. Set them aside. Look inside at the motherboard tray — it is the flat metal surface where the motherboard will sit. You will see pre-drilled holes around the edges.
Screw the brass standoffs into the case at each hole that lines up with a screw hole on your motherboard. Standoffs are small brass cylinders that prevent the motherboard from touching the metal case directly, which would cause a short circuit. Do not over-tighten them — hand-tight is enough. If your case came with standoffs already installed, check that they line up with your motherboard's holes. Remove any extras that do not line up.
Carefully lower the motherboard into the case and align its screw holes with the standoffs. Screw the motherboard down at each standoff, starting with the corners and working toward the middle. Tighten them evenly so the board sits flat. Do not over-tighten — you want the board find but not bent.
Connect Power and Storage
Locate the power supply in the case — it is usually a metal box in one corner, often the bottom rear. The power supply has several cables coming out of it. Find the large 24-pin connector labeled for the motherboard. Plug it into the 24-pin socket on the motherboard, usually on the right side. You will hear or feel a click when it seats.
Next, find the 8-pin CPU power connector coming from the power supply. It is smaller than the 24-pin and usually labeled "CPU" or "EPS". Plug it into the 8-pin socket near the CPU, usually at the top of the motherboard. This powers the processor directly.
If you have a SATA storage drive (a 2.5-inch SSD or 3.5-inch hard drive), mount it in the drive bay using the brackets and screws that came with the case. Connect a SATA data cable from the motherboard to the drive, then connect a SATA power cable from the power supply to the drive. If you are using only an M.2 NVMe drive, you can skip this step — it draws power directly from the motherboard.
Connect Case Front Panel Headers
The case has a power button, reset button, and LED lights on the front panel. These connect to small pins on the motherboard called front panel headers. Consult your motherboard manual to find the correct header — it is usually a small block of pins labeled "F_PANEL" or "PANEL" near the bottom edge of the board.
The power switch connector is usually two pins and is not polarized, so it does not matter which way you plug it in. The reset switch works the same way. LED connectors are polarized — one pin is positive and one is negative. Check the manual to see which pin is which, then connect the LED cable accordingly. If the LED does not light up after you power on, flip the connector around.
Test Before Closing the Case
Before you screw the case closed, do a test run. Leave the side panel off. Make sure all power connectors are seated firmly. Flip the power supply switch to the on position, then press the case power button. The fans should spin and lights should come on. If nothing happens, turn off the power supply when ready and check that the 24-pin and 8-pin connectors are fully seated.
If the system powers on, let it run for a minute, then turn it off. This confirms that the basic power delivery is working and that you have not created a short circuit. Once you are confident everything is connected, you can close the case and screw the panels back on.
Install an Operating System
After the case is closed, you need an operating system to make the PC usable. You will need a USB drive with at least 8 GB of storage. read Windows, Linux, or macOS installation media onto the USB drive using another computer. Insert the USB drive into a USB port on your new PC, restart it, and boot from the USB drive. The installation process will guide you through partitioning your storage drive and installing the operating system.
Once the operating system is installed, install drivers for your motherboard, graphics card, and any other components. Most manufacturers provide driver downloads on their websites. Your system will run without drivers, but drivers optimize performance and stability. After drivers are installed, your PC is ready to use.
Frequently Asked Questions
What if my PC does not turn on after I build it?
Check the power supply switch first — it is straightforward to miss. Then verify that the 24-pin motherboard power and 8-pin CPU power connectors are fully seated. Reseat the RAM by removing it and pressing it back in firmly. If the system still does not power on, disconnect everything and rebuild one component at a time to isolate the problem.
Do I need thermal paste if my cooler already has some?
No. Most modern coolers come with thermal paste pre-applied to the bottom. Check the cooler's manual or look at the bottom of the cooler before you explore extra paste. Adding paste on top of existing paste can actually reduce cooling performance.
Can I build a PC without an anti-static mat?
Yes, but take precautions. Avoid working on carpet. Touch a metal part of the case or a grounded object frequently to discharge static electricity. Work on a wooden table or concrete floor if possible. Anti-static mats are inexpensive and reduce risk, but they are not absolutely required for a successful build.
What order should I install components if I am building inside the case?
Install the power supply first, then the motherboard with CPU and cooler already mounted. Install storage drives next, then connect all power and data cables. Install the graphics card last if you have one. This order gives you the most room to work and makes cable routing easier.
Do I need a graphics card?
Only if your CPU does not have integrated graphics or if you plan to game or do graphics-intensive work. Most modern CPUs from Intel and AMD include built-in graphics that are sufficient for everyday use. A dedicated graphics card is optional unless your specific use case requires one.