How to Build a Desktop PC: A Step-by-Step Beginner Guide

How to build a desktop PC

Core tooliFixit Mahi Driver Kit - 48 Bit Driver KitA magnetic 1/4-inch driver with Phillips #2 and a useful screw tray.

Mahi DriveriFixit

ESD optioniFixit Anti-Static Wrist StrapHelps equalise charge when correctly connected to ground.

ESD StrapiFixit

If neededNoctua NT-H2 3.5g Thermal CompoundOnly for a cooler without pre-applied paste or a remount.

NT-H2 3.5gUmart

Price and availability check — 29 September 2026: These are optional tool examples, not a parts bundle. Compare the current checkout price and shipping before ordering. A well-fitting driver you already own may be sufficient, and thermal paste is unnecessary when the cooler has it pre-applied.

Most useful tool pick

iFixit Mahi Driver Kit - 48 Bit Driver Kit

iFixit Mahi Driver Kit - 48 Bit Driver Kit

A magnetic 1/4-inch driver with a Phillips #2 bit and a sorting tray, useful for common case work. This is a research-led tool choice, not a claim of hands-on testing.

The short answer

Check exact component compatibility, follow each manual and work with the computer unplugged. Install the CPU, M.2 drive and memory on the motherboard box, then prepare the cooler and case. Fit the board and PSU, connect power and front-panel leads, install the graphics card, inspect everything and boot at default settings before Windows or tuning.

Tool shortlist

You do not need to buy every example below. Choose the driver if you lack a suitable one, a wrist strap if you can ground it correctly, and separate paste only when the cooler requires it.

How we chose the tools

We matched the source guide's actual tasks to exact Australian listings and manufacturer specifications, prioritising a usable Phillips #2 driver, correct ESD practice and avoiding unnecessary compound. This is an editorial assessment of published information and local availability, not hands-on testing. No affiliate links or tracking codes were supplied.

Core tool

1. iFixit Mahi Driver Kit - 48 Bit Driver Kit

Our most useful single tool pick for a first PC build.

The 1/4-inch magnetic driver includes Phillips #2 for common case fasteners, while the lid helps organise screws. A dedicated smaller driver may still be needed for some M.2 screws. If you already own a well-fitting magnetic Phillips driver, you do not need this entire kit.

48 bitsResearch-led pick

What works

• Magnetic driver and Phillips #2 bit
• Case lid doubles as a sorting tray

Limitations

• More bits than a basic build needs
• A tiny M.2 screw may need a smaller driver

Best for: A beginner who needs a dependable driver for this build and later household repairs.

Mahi DriveriFixit

ESD option

2. iFixit Anti-Static Wrist Strap

A practical option for controlling static in a suitable workspace.

The strap is useful only when worn and connected correctly to a proper ground. It does not replace unplugging the computer, careful handling or following the motherboard manual. Touching bare chassis metal regularly is another approach described in the source guide.

Grounding leadResearch-led pick

What works

• Keeps both hands free after correct connection
• Simple, reusable accessory

Limitations

• No ESD benefit if it is not grounded
• Does not make an unsafe work area safe

Best for: Builders who can establish a correct grounding point and want continuous charge equalisation.

ESD StrapiFixit

If needed

3. Noctua NT-H2 3.5g Thermal Compound

Buy paste only when the cooler instructions call for it.

Noctua supplies a 3.5g syringe and cleaning wipes. Follow the cooler or compound instructions for the application amount and pattern. Many new coolers already have compound applied: do not add NT-H2 on top or buy it merely because it appears in a build list.

3.5gResearch-led pick

What works

• Suitable separate compound for an unpasted cooler
• Includes cleaning wipes

Limitations

• Unnecessary with pre-applied cooler compound
• Correct installation matters more than paste branding

Best for: A build whose cooler lacks pre-applied compound, or a cooler that must be cleaned and remounted.

NT-H2 3.5gUmart

The complete build order

Step 1: Confirm compatibility before buying

Compatibility checking prevents most disastrous builds. Record the exact model number of every part rather than relying on broad names such as “Ryzen 7,” “Core Ultra 7” or “DDR5 motherboard.”

Confirm all of the following:

• Processor and socket: The CPU must use the motherboard’s socket.
• BIOS support: The installed firmware must recognise that exact processor.
• Memory: DDR4 and DDR5 are not interchangeable. Check supported capacity, speed and module arrangement.
• Cooler: It needs the correct socket hardware and must clear the case, memory and motherboard components.
• Motherboard size: ATX, micro-ATX or mini-ITX must fit the case.
• Graphics card: Check length, height, slot thickness and power-cable clearance with case fans or radiators installed.
• Power supply: Confirm quality, capacity and every required connector.
• Storage: Verify M.2 length, NVMe or SATA support and whether using a slot disables another port.
• Operating system: Confirm Windows 11 processor support, UEFI, Secure Boot and TPM 2.0.

The motherboard manual and CPU-support page are the final authority. A parts-list website is useful for screening, but it may not understand every BIOS version, lane-sharing rule or physical clearance problem.

Step 2: Prepare the workspace

Use a large, clean table with good lighting and a hard floor where practical. Keep screws sorted and retain every spare cable, bracket and manual until the computer is working.

Useful tools include:

• a good magnetic-tip Phillips screwdriver;
• a smaller screwdriver for M.2 hardware if required;
• side cutters or scissors for cable ties;
• reusable hook-and-loop cable straps;
• a torch;
• isopropyl alcohol and lint-free material if thermal paste must be cleaned; and
• the printed or downloaded manuals.

Touch the bare metal chassis regularly to equalise electrical potential, or use a correctly connected anti-static wrist strap. Keep components in anti-static packaging until needed and hold circuit boards by their edges.

Step 3: Inspect everything before assembly

Check boxes and components for shipping damage, bent metal, cracked sockets or missing accessories. Photograph serial numbers and keep purchase records. Do not remove every protective film yet—some panels are easier to protect until the build is complete—but remove any film that would become trapped under a heatsink or inside the case.

Step 4: Install the processor

Place the motherboard flat on its cardboard box or another clean, firm, non-conductive surface. Do not use the outside of an anti-static bag as a work mat.

1. Release the processor-socket retention mechanism exactly as the motherboard manual shows.
2. Hold the CPU only by its edges.
3. Match the marked corner and socket alignment features.
4. Lower the processor straight into position without sliding or pressing it.
5. Close and lock the retention mechanism.

AMD AM5 and modern Intel desktop sockets contain delicate pins in the motherboard socket. Never touch them. The protective socket cover may release as the mechanism closes; follow the manual and keep the cover for any future warranty return.

Step 5: Install the M.2 SSD

Use the preferred M.2 slot identified in the motherboard manual. It is often the slot connected directly to the processor, but lane sharing and supported drive types vary.

1. Remove the M.2 heatsink if fitted.
2. Check that the standoff or tool-free latch matches the drive length.
3. Insert the SSD into the slot at the angle shown in the manual.
4. Lower and secure it without overtightening a tiny screw.
5. Remove the protective plastic from the heatsink’s thermal pad.
6. Refit the heatsink evenly.

Do not add a second thermal pad when the motherboard heatsink already provides one unless the instructions require it.

Step 6: Install the memory

For two modules on a four-slot motherboard, the recommended positions are commonly the second and fourth slots from the CPU, but the manual decides.

1. Open the retaining clips that are designed to move.
2. Align the offset notch in the memory module with the slot.
3. Press straight down at both ends until the module is fully seated and the clips lock.

Memory often requires firmer pressure than beginners expect, but never force it when the notch is misaligned. Compare both installed modules—the exposed contacts should be equally hidden.

Step 7: Prepare and install the CPU cooler

Cooler installation varies greatly. Read its instructions for the exact socket and identify which original motherboard brackets or backplate must remain.

If the cooler has pre-applied thermal compound, do not add more. If it does not, apply the manufacturer’s recommended amount and pattern. Too much paste can create mess; too little or poor mounting can raise temperatures.

1. Install the correct backplate, spacers and brackets.
2. Remove the clear protective film from the cooler contact plate.
3. Place the cooler squarely onto the processor.
4. Tighten mounting screws gradually in an alternating pattern.
5. Connect the cooler fan to the labelled CPU-fan header.

For a liquid cooler, plan radiator position and tube routing before fixing the motherboard into the case. Do not sharply bend tubes or allow cables to touch fans.

Step 8: Prepare the case

Remove both side panels and the front panel only as the case instructions permit. Lay the case on its side.

Check motherboard standoffs carefully. There must be one under each mounting hole you will use and no extra standoff touching the underside of the board. An incorrectly placed standoff can short circuitry.

If the motherboard has a separate rear input-output shield, clip it into the case before installing the board. Many modern boards have the shield attached permanently.

Step 9: Install the motherboard

1. Lower the board into the case while aligning its rear ports and mounting holes.
2. Make sure no shield tab enters a USB, network or display port.
3. Start every motherboard screw loosely.
4. Tighten them until secure, not excessively tight.

The board should sit naturally on the standoffs. Do not use screws to drag it into alignment.

Step 10: Install the power supply

Orient the power-supply fan toward a filtered ventilation opening where the case design provides one. If the unit is modular, connect only the required cables before placing it in a cramped compartment.

Typical cables include:

• 24-pin motherboard power;
• one or more CPU/EPS power leads;
• graphics-card PCIe or current high-power connector;
• SATA power for drives, fan hubs or accessories; and
• case-specific controller power where required.

CPU/EPS and graphics-card PCIe plugs can look similar but are not interchangeable. Use the labels and manuals. Never reuse modular cables from another power supply unless the manufacturer explicitly confirms compatibility for both exact models.

Step 11: Install case fans and additional drives

Plan a clear airflow path—usually cool air entering at the front or bottom and warm air leaving at the rear or top. Fan-frame markings often show airflow direction.

Secure 2.5-inch or 3.5-inch drives in their correct trays and connect both SATA data and SATA power where required. Keep cables away from fan blades and avoid crushing them behind the side panel.

Step 12: Connect motherboard and case wiring

Connect the large 24-pin motherboard cable and CPU power near the top of the board. A system may light up but fail to start if CPU power is missing.

Then connect:

• CPU and case fans to suitable headers;
• front USB and USB-C cables;
• front audio;
• power switch, reset switch and indicator LEDs;
• SATA data cables; and
• fan or lighting controllers.

The front-panel header is small and easy to misread. Use the motherboard diagram. Switch plugs normally have no electrical polarity, while LED plugs do.

Step 13: Install the graphics card

1. Remove the correct rear expansion-slot covers.
2. Open the motherboard’s main PCIe-slot latch.
3. Align the card and press it evenly into the slot until fully seated.
4. Secure its bracket to the case.
5. Fit a support if the card is heavy.
6. Connect every required graphics power plug fully.

Check current high-power connectors from multiple angles. They must be inserted completely, with enough space before the cable bends. Follow the card and power-supply instructions rather than copying a photograph from another build.

Step 14: Complete the pre-start inspection

Before applying power, check:

• no loose screw remains under the motherboard;
• CPU cooler film was removed;
• CPU fan or pump is connected to the correct header;
• memory is fully seated;
• 24-pin and CPU power connectors are locked;
• graphics card and its power cables are fully seated;
• no cable can touch a fan;
• the power-supply voltage selector, if present, is correct;
• the monitor is connected to the graphics card when using a dedicated GPU; and
• the case power button is connected correctly.

Step 15: First boot

Connect one monitor, keyboard and power cable. Leave unnecessary USB devices disconnected. Switch on the power supply, then press the case power button.

The first start can take longer than expected, especially while a DDR5 system trains its memory. It may restart more than once. Do not immediately cut power unless there is smoke, a burning smell, liquid leakage, sparking or another clear safety problem.

Enter the UEFI or BIOS and confirm:

• processor model and reasonable idle temperature;
• installed memory capacity;
• all storage drives;
• CPU fan or pump speed;
• date and time; and
• boot mode and installation-media detection.

If the new PC does not display an image

Change one thing at a time. Photograph the debug lights and connections before disassembling the computer. If uncertain, stop and use the retailer’s or manufacturer’s support rather than repeatedly forcing parts.

Step 16: Configure the BIOS carefully

Begin at default settings. If the installed BIOS is known to have security, stability or CPU-support fixes, follow the motherboard manufacturer’s update instructions. Do not update during unstable power, and never interrupt the process.

After the computer proves stable, consider enabling:

• the supported XMP or EXPO memory profile;
• Resizable BAR or Smart Access Memory;
• appropriate fan curves;
• TPM 2.0 and Secure Boot for Windows 11; and
• virtualisation only when needed.

XMP and EXPO settings are memory overclocking profiles rather than guarantees for every CPU, board and kit. If instability begins after enabling one, return to defaults and test at a lower supported setting.

Step 17: Install Windows

Create official Windows 11 installation media on a known-working computer using Microsoft’s Media Creation Tool. Back up anything on the USB drive because the creation process can erase it.

1. Boot the new PC from the installation USB.
2. Select the correct target drive carefully.
3. Complete installation and activation with a legitimate licence.
4. Run Windows Update repeatedly until important updates are complete.
5. Install current chipset, graphics, network and audio drivers from official sources.
6. Check Device Manager for missing or incorrectly identified hardware.

Do not install every utility offered by the motherboard or peripheral maker. Use only software required for hardware control, updates or features you need.

Step 18: Test before trusting the computer

Monitor temperatures and stability before loading valuable files. Test:

• memory for errors;
• processor under sustained load;
• graphics card under gaming or rendering load;
• storage health and expected interface speed;
• all USB, audio, network and display connections; and
• sleep, restart and shutdown behaviour.

A stress test should not be left unattended on a new, unverified build. Stop if temperatures rise abnormally, fans fail, instability appears or there is an electrical smell.

Step 19: Finish cable management and backups

Once testing succeeds, shut down and disconnect power. Bundle cables without overtightening them, preserve gentle bends near plugs and confirm the side panel does not press against connectors.

Create a recovery plan immediately. Keep important files in more than one place, enable suitable device encryption and record recovery keys somewhere secure. A newly built PC is not a backup.

Mistakes to avoid

• Forcing the CPU: Correctly aligned processors require no downward pressure into the socket.
• Leaving cooler film attached: It prevents proper heat transfer.
• Using the wrong modular cables: This can destroy drives or other components.
• Forgetting CPU power: It is separate from the 24-pin motherboard cable.
• Installing memory in the wrong slots: Follow the manual.
• Leaving an extra standoff: It can short the motherboard.
• Connecting the monitor to the wrong port: Use the graphics card when a dedicated card provides the display.
• Enabling every performance setting immediately: Establish a stable default baseline first.
• Closing the case before testing: Keep access until the first boot succeeds.
• Throwing out packaging: Boxes and socket covers may be required for safe returns.

Frequently asked questions

Is building a PC difficult for a beginner?

It requires patience more than advanced technical skill. Compatibility research, manuals, careful handling and a methodical build order are more important than speed.

How long does a first PC build take?

Allow most of a day without pressure. Complicated cooling, poor instructions or troubleshooting can extend the job. Rushing creates preventable mistakes.

Should I test the motherboard outside the case?

An experienced builder may perform a basic bench test before case installation. A beginner can do so if following safe instructions, but must avoid conductive surfaces and exposed moving parts. It is not compulsory for an ordinary build.

How much thermal paste should I use?

Follow the cooler or paste manufacturer’s instructions. Many coolers arrive with paste applied. Do not add more on top of pre-applied compound.

Do I need to update the BIOS first?

Only when the installed version lacks CPU support or an important manufacturer fix applies. BIOS updates carry risk if interrupted, so follow the exact board instructions.

Should I install all motherboard software?

No. Install essential chipset, network, audio and graphics drivers from official sources. Add control utilities only when you need their functions.

Sources and price checks

• Microsoft: Create Windows 11 installation media
• Microsoft: Windows 11 specifications and requirements
• Microsoft Support: Enable TPM 2.0
• Microsoft Support: Windows Update guidance
• AMD Support: Processor installation guidance
• Intel: How to build a gaming PC
• ASUS Support: M.2 and storage detection checks
• ACCC: Warranties and consumer guarantees
• iFixit: iFixit Mahi Driver Kit - 48 Bit Driver Kit Australian listing
• iFixit: iFixit Anti-Static Wrist Strap Australian listing
• Umart: Noctua NT-H2 3.5g Thermal Compound Australian listing
• Noctua: NT-H2 3.5g product information

Australian product listings and availability checked 29 September 2026. Prices and stock can change. Check your exact parts and current checkout total; the motherboard, cooler, case and PSU manuals decide the installation details.