Intermediate Computer Hardware Course
Build Your Own Computer
Building your own computer gives you greater control over performance, features, upgrade options and budget.
In this intermediate course, you will learn how the major components of a desktop computer work together and how to select compatible hardware based on your intended use.
You will assemble the processor, motherboard, memory, storage, cooling system, power supply and graphics card inside a computer case while following proper handling and anti-static precautions. You will also learn how to perform the first startup, configure BIOS or UEFI settings, install an operating system, install device drivers and troubleshoot common hardware problems.
Learning Outcomes
What you will be able to do after completing this course.
By the end of this course, you should be able to plan, assemble, configure, test, document and maintain a complete desktop computer.
- Explain the purpose of major desktop components.
- Identify CPU, motherboard, memory, storage, GPU and PSU roles.
- Match a computer specification to its intended use.
- Plan a balanced specification within a budget.
- Check processor and motherboard socket compatibility.
- Match the motherboard form factor to the case.
- Select compatible memory type, speed and capacity.
- Compare HDD, SATA SSD and NVMe SSD storage.
- Select a suitable graphics card.
- Estimate power-supply capacity.
- Choose a suitable CPU cooler.
- Prepare a safe and organised workspace.
- Apply anti-static precautions.
- Install a processor safely.
- Apply thermal paste and install the cooler.
- Install memory in recommended slots.
- Install M.2 and SATA storage devices.
- Install motherboard standoffs and secure the board.
- Install and secure the power supply.
- Connect motherboard, CPU, storage and GPU power.
- Connect case buttons, LEDs and front-panel ports.
- Install a dedicated graphics card.
- Arrange cables for airflow and maintenance.
- Inspect all connections before power-on.
- Perform the first startup and recognise POST.
- Navigate BIOS or UEFI.
- Verify hardware detection and fan operation.
- Enable the supported memory profile.
- Configure boot-device priority.
- Create and use an operating-system installer.
- Install an operating system.
- Install motherboard, graphics, network and audio drivers.
- Apply operating-system and firmware updates.
- Monitor CPU and GPU temperatures.
- Test memory, storage and system stability.
- Troubleshoot power-on with no display.
- Identify common boot and shutdown problems.
- Use diagnostic lights, beep codes and indicators.
- Document components, serial numbers and warranties.
- Plan future upgrades.
- Maintain the computer through cleaning and inspections.
Course Roadmap
Follow the build sequence or select a lesson to review.
Understanding the Major Components
Learn how the main parts of a desktop computer work together.
Lesson objective:
Identify the major internal components and explain their roles.
Processor
Executes instructions and performs general computing work.
Motherboard
Connects and coordinates the computer's major components.
Memory
Provides fast temporary storage for active programs and data.
Storage
Stores the operating system, applications and user files.
Graphics Card
Processes graphics and outputs images to the display.
Power Supply
Converts mains electricity into regulated power for the computer.
The case, cooling system, fans, cables and expansion cards also affect
performance, compatibility, noise and maintenance.
Component Exercise
- Identify each major component in a sample desktop computer.
- Write one sentence describing each component's role.
- Trace how power and data move between components.
Planning a Balanced Computer Specification
Match performance, features and budget to the intended use.
Lesson objective:
Plan a suitable computer for office work, general use, gaming or
content creation.
| Use | Main Priorities |
|---|---|
| Office Work | Efficiency, reliability, quiet operation and moderate storage |
| General Use | Balanced CPU, sufficient memory and responsive SSD storage |
| Gaming | Graphics performance, CPU balance, cooling and power capacity |
| Content Creation | Multi-core CPU, memory capacity, fast storage and GPU acceleration |
Budget Planning Principles
- Set the total budget before selecting components.
- Prioritise components that affect the main workload.
- Include the operating system and peripherals where required.
- Allow budget for cooling, fans and cables.
- Avoid spending heavily on one component while restricting another.
- Reserve some capacity for future upgrades.
Specification Exercise
- Choose one intended use.
- Set a total budget.
- Allocate a target budget to CPU, GPU, storage and other parts.
- Write the minimum required performance and features.
Checking Hardware Compatibility
Confirm socket, form factor, memory and physical compatibility.
Lesson objective:
Check the most important compatibility relationships before purchase.
Compatibility Checklist
- CPU socket matches the motherboard socket.
- Motherboard chipset supports the processor generation.
- Motherboard BIOS or UEFI supports the selected processor.
- Motherboard form factor fits the case.
- Memory generation and type match the motherboard.
- Memory capacity and speed are supported.
- CPU cooler supports the socket and fits the case.
- Graphics card length, height and slot thickness fit the case.
- Power supply fits the case and provides the required connectors.
| Form Factor | General Characteristic |
|---|---|
| ATX | Full-sized board with greater expansion capacity |
| Micro-ATX | Smaller board with moderate expansion |
| Mini-ITX | Compact board for small-form-factor builds |
A component may physically fit but still be electrically or
firmware-incompatible. Check the motherboard support list and manuals.
Compatibility Exercise
- Select a processor and motherboard.
- Confirm socket and chipset support.
- Check the required BIOS or UEFI version.
- Match the board form factor to a case.
- Confirm memory support.
Selecting Storage, Graphics and Power
Balance speed, capacity, physical fit and power requirements.
Lesson objective:
Compare storage types, select a graphics card and estimate PSU needs.
| Type | Strength | Typical Use |
|---|---|---|
| Hard Disk Drive | Lower cost per unit of storage | Large archives and secondary storage |
| SATA SSD | Fast and widely compatible | Operating systems and general applications |
| NVMe SSD | Very high performance through PCIe | Primary storage, demanding applications and fast projects |
Graphics Card Selection
- Performance matches the intended resolution and workload.
- Card length and thickness fit the case.
- Power supply has sufficient capacity.
- Required PCIe power connectors are available.
- Case airflow supports the card's heat output.
- Display outputs match the monitor connection.
Power-Supply Planning
- Use a reputable PSU with adequate continuous output.
- Allow reasonable headroom above estimated system draw.
- Check motherboard, CPU and GPU connector requirements.
- Consider future upgrades.
- Choose suitable efficiency and warranty coverage.
Selection Exercise
- Choose primary and secondary storage.
- Select a graphics card for the target workload.
- Check the graphics-card dimensions.
- Estimate power needs and choose an appropriate PSU.
Planning Cooling and Airflow
Choose a CPU cooler and create a sensible case-airflow path.
Lesson objective:
Select suitable cooling and understand intake, exhaust and clearance.
Air Cooler
Uses a heatsink and fan. Check socket support, height and memory clearance.
Liquid Cooler
Uses a pump, radiator and fans. Check radiator size, placement and case compatibility.
Airflow Principles
- Front and lower fans usually act as intake.
- Rear and upper fans usually act as exhaust.
- Keep cables clear of major airflow paths.
- Use dust filters where available.
- Balance cooling performance, noise and maintenance.
More fans do not automatically improve cooling. Correct placement and
unobstructed airflow are more important.
Cooling Exercise
- Choose a CPU cooler compatible with the socket.
- Check cooler and radiator clearance.
- Draw the intended airflow direction.
- Plan intake and exhaust fan positions.
Preparing the Workspace Safely
Organise tools, components and anti-static precautions.
Lesson objective:
Prepare a clean, safe and organised area before handling components.
Workspace Checklist
- Use a clean, stable and well-lit table.
- Avoid thick carpet where practical.
- Keep drinks and food away.
- Prepare a suitable screwdriver and small parts container.
- Keep manuals and component packaging nearby.
- Use an anti-static wrist strap or regularly ground yourself safely.
- Handle circuit boards by the edges.
Power Safety
- Disconnect mains power before installing or moving components.
- Do not open the power-supply enclosure.
- Do not force connectors.
- Use only the cables intended for the installed power supply.
- Keep screws and tools away from powered components.
A power supply can retain dangerous electrical energy. Never open or
repair the PSU enclosure unless you are appropriately qualified.
Preparation Exercise
- Clear and clean the work surface.
- Arrange tools and screws.
- Place components in installation order.
- Set up anti-static protection.
Installing the Processor
Align and seat the CPU without damaging contacts or the socket.
Lesson objective:
Install the processor correctly using the socket alignment markers.
- Place the motherboard on its box or another safe flat surface.
- Release the CPU socket retention mechanism.
- Identify the processor and socket alignment marker.
- Hold the processor by its edges.
- Lower it straight into the socket without force.
- Confirm it sits flat and aligned.
- Close and secure the retention mechanism.
Never slide or press the processor into place. If it does not settle
naturally, stop and check the orientation.
Processor Exercise
- Identify the socket type.
- Locate the alignment markers.
- Practise the installation sequence using the manual.
- Inspect the socket before closing the retention mechanism.
Applying Thermal Paste and Installing the Cooler
Create proper contact between the processor and cooling system.
Lesson objective:
Apply an appropriate amount of thermal compound and mount the cooler
evenly.
Installation Sequence
- Confirm whether the cooler already has thermal compound applied.
- Install the correct backplate and mounting hardware where required.
- Apply thermal paste according to the cooler or CPU guidance.
- Position the cooler carefully over the processor.
- Tighten mounting screws gradually in an alternating pattern.
- Connect the cooler fan or pump to the correct motherboard header.
Too much thermal paste can create a mess, while too little may reduce
contact. Use the cooler manufacturer's recommended method.
Cooler Exercise
- Identify the cooler mounting hardware.
- Check whether thermal paste is pre-applied.
- Install the cooler evenly.
- Connect the CPU fan or pump header.
Installing Memory and Storage
Fit RAM modules, M.2 drives and SATA devices correctly.
Lesson objective:
Install memory in recommended slots and secure supported storage.
Memory Installation
- Read the motherboard's recommended slot order.
- Open the DIMM-slot latches as required.
- Align the memory notch with the slot key.
- Press evenly until the module is fully seated and latched.
- Repeat for additional modules.
M.2 Storage Installation
- Identify the correct M.2 slot and supported drive type.
- Remove the heatsink or retaining screw.
- Insert the drive at the specified angle.
- Lower and secure the drive.
- Replace the heatsink and thermal pad where supplied.
SATA Storage Installation
- Secure the drive in the correct bay or tray.
- Connect a SATA data cable to the motherboard.
- Connect a SATA power cable from the PSU.
- Route cables without blocking fans.
Installation Exercise
- Install two memory modules in the recommended slots.
- Install an M.2 drive.
- Install one SATA drive where available.
- Inspect all seating and fasteners.
Preparing the Case and Installing the Motherboard
Position standoffs correctly and secure the board without damage.
Lesson objective:
Prepare the case, install the I/O shield where required and mount the
motherboard safely.
- Remove the case side panels.
- Identify motherboard mounting positions.
- Install standoffs only where matching motherboard holes exist.
- Install the separate I/O shield if the board requires one.
- Lower the motherboard into the case.
- Align rear ports and mounting holes.
- Secure the board with the correct screws.
- Tighten until secure without overtightening.
An extra standoff under the motherboard can cause a short circuit.
Verify every standoff matches a mounting hole.
Case Exercise
- Identify the motherboard form factor.
- Configure the standoff positions.
- Install the I/O shield if required.
- Mount and secure the motherboard.
Installing the Power Supply and Main Cables
Secure the PSU and connect power to the correct components.
Lesson objective:
Install the PSU and connect motherboard, CPU, storage and graphics
power safely.
Main Power Connections
| Connector | Purpose |
|---|---|
| 24-pin ATX | Main motherboard power |
| CPU EPS | Processor power near the CPU socket |
| PCIe or GPU Power | Dedicated graphics-card power |
| SATA Power | SATA drives, hubs and supported accessories |
Installation Principles
- Orient the PSU fan toward a ventilated opening.
- Secure the PSU with the correct screws.
- Use only modular cables supplied for that exact PSU model.
- Match connector labels carefully.
- Push connectors fully into place without forcing them.
Modular power-supply cables are not universally interchangeable.
Using the wrong cable can damage components.
Power Exercise
- Install the PSU.
- Connect the 24-pin motherboard cable.
- Connect the CPU EPS cable.
- Connect SATA power where required.
- Prepare the correct GPU power cable.
Connecting the Case Controls and Ports
Wire the power button, LEDs, USB, audio and case fans.
Lesson objective:
Connect the case front panel and headers according to the motherboard
manual.
Common Front-Panel Connections
- Power switch
- Reset switch
- Power LED
- Storage activity LED
- Front USB 2.0
- Front USB 3.x
- Front USB-C where supported
- Front-panel audio
- Case fan headers
Switch connectors normally work in either orientation, while LED
connectors usually require correct positive and negative polarity.
Front-Panel Exercise
- Locate the front-panel header diagram.
- Connect the power and reset switches.
- Connect the power and storage LEDs.
- Connect USB and audio headers.
- Connect case fans.
Installing the Graphics Card and Managing Cables
Secure the GPU and organise cables for airflow and maintenance.
Lesson objective:
Install the graphics card in the correct slot and create a clean
cable layout.
- Identify the recommended full-length PCIe slot.
- Remove the required case expansion-slot covers.
- Open the PCIe slot latch where required.
- Align and press the graphics card evenly into the slot.
- Secure the card to the case.
- Connect the required GPU power cables.
- Support a very heavy card where recommended.
Cable Management Principles
- Route cables behind the motherboard tray where possible.
- Keep cables away from fans.
- Avoid tight bends near connectors.
- Leave enough slack for maintenance.
- Bundle related cables without overtightening ties.
GPU Exercise
- Install the graphics card.
- Connect the required PCIe power cable.
- Secure and support the card.
- Route and tie the main cable groups.
Inspecting and Performing the First Startup
Verify connections and recognise a successful Power-On Self-Test.
Lesson objective:
Complete a pre-power inspection and interpret the first startup.
Pre-Power Inspection
- CPU and cooler are secured.
- CPU fan or pump is connected.
- Memory is fully seated.
- Storage is secured and connected.
- 24-pin and CPU power are connected.
- GPU is seated and powered.
- No loose screws remain inside the case.
- Fans can rotate freely.
- Monitor is connected to the intended graphics output.
First Startup Sequence
- Connect the monitor, keyboard and power cable.
- Switch on the PSU.
- Press the case power button.
- Observe fans, lights and diagnostic indicators.
- Wait for the manufacturer logo or BIOS screen.
- Enter BIOS or UEFI when prompted.
The first startup can take longer than later boots while the
motherboard performs memory training and hardware detection.
First-Startup Exercise
- Complete the inspection checklist.
- Connect the monitor to the correct output.
- Power on the computer.
- Record the diagnostic indicators.
- Confirm a successful POST.
Configuring BIOS or UEFI
Verify hardware detection and prepare the system for installation.
Lesson objective:
Check detected hardware, configure memory and set boot priority.
Items to Verify
- Processor model
- Total memory capacity
- Storage devices
- CPU and system fan speeds
- CPU temperature
- Boot mode
- Date and time
Common Initial Settings
- Enable the supported memory performance profile.
- Confirm fan control is active.
- Set the operating-system installer as the temporary first boot device.
- Enable security features required by the intended operating system.
- Save changes and restart.
Change only settings you understand. Record original values before
changing advanced voltage, frequency or security options.
BIOS Exercise
- Enter BIOS or UEFI.
- Verify CPU, memory and storage detection.
- Check CPU temperature and fan speed.
- Enable the correct memory profile where supported.
- Set the installation drive as the first boot device.
Installing the Operating System and Drivers
Create installation media, install the OS and configure hardware support.
Lesson objective:
Install an operating system and the required device drivers.
Installation Workflow
- Create a bootable installer using the official operating-system source.
- Connect the installation drive.
- Boot from the installer.
- Select the correct target storage device.
- Create or select partitions as required.
- Complete the operating-system setup.
- Install updates.
Driver Installation Order
- Motherboard chipset
- Network adapter
- Graphics driver
- Audio driver
- Storage or controller driver where required
- Additional device drivers
Obtain drivers and firmware from the component or motherboard
manufacturer's official support page.
Installation Exercise
- Create a bootable installation drive.
- Install the operating system.
- Install chipset and network drivers.
- Install graphics and audio drivers.
- Apply available system updates.
Testing Stability and Temperatures
Verify memory, storage, cooling and overall system reliability.
Lesson objective:
Monitor temperatures and run controlled tests after installation.
Initial Testing Areas
- Processor temperature at idle and under load
- Graphics-card temperature under load
- Memory stability
- Storage health and performance
- Fan operation and noise
- System stability during normal workloads
Testing Process
- Install trusted monitoring software.
- Record idle temperatures.
- Run a short controlled CPU test.
- Run a short graphics workload where applicable.
- Test memory.
- Check storage health.
- Stop immediately if temperatures or behaviour become abnormal.
Do not leave a new build unattended during initial stress testing.
Stop the test if temperatures rise excessively, fans fail or the
system becomes unstable.
Testing Exercise
- Record idle CPU and GPU temperatures.
- Run a short controlled load test.
- Test memory and storage.
- Record results and any unusual behaviour.
Troubleshooting and Maintaining the Computer
Diagnose common startup problems and plan long-term care.
Lesson objective:
Use a structured process to diagnose hardware faults and maintain the
completed computer.
| Problem | First Checks |
|---|---|
| Powers on but no display | Monitor input, GPU seating, GPU power, memory seating and diagnostic lights |
| No power | Wall power, PSU switch, front-panel connector, 24-pin and CPU power |
| Unexpected shutdown | Temperatures, cooler mounting, PSU capacity and loose cables |
| Storage not detected | Power, data cable, M.2 slot support and BIOS detection |
| Memory capacity incorrect | Module seating, slot order, compatibility and diagnostic indicators |
Diagnostic Resources
- Motherboard diagnostic LEDs
- Beep codes
- POST code display
- Motherboard manual
- Known-good test components
- Minimal hardware configuration
Maintenance Routine
- Clean dust filters and vents regularly.
- Inspect fans and cables.
- Apply operating-system and driver updates.
- Review storage health.
- Monitor temperatures periodically.
- Document upgrades and warranty changes.
Troubleshooting Exercise
- Review a no-display troubleshooting checklist.
- Identify diagnostic indicators on the motherboard.
- Practise reducing the system to a minimal configuration.
- Create a maintenance schedule.
Final Project: Plan, Build and Configure a Desktop Computer
Apply the complete hardware-selection and assembly workflow.
Project objective:
Select compatible parts, assemble the computer, configure firmware,
install software, test stability and document the final system.
Project Requirements
- Define the intended workload and budget.
- Create a complete component list.
- Verify CPU and motherboard compatibility.
- Verify case, cooler, memory and GPU fit.
- Estimate power requirements.
- Prepare a safe workspace.
- Install the processor.
- Install thermal paste and the CPU cooler.
- Install memory and storage.
- Configure case standoffs.
- Install the motherboard.
- Install the power supply.
- Connect all power cables.
- Connect front-panel controls and ports.
- Install the graphics card.
- Manage cables and verify airflow.
- Complete the pre-power inspection.
- Perform the first startup and POST.
- Configure BIOS or UEFI.
- Install the operating system and drivers.
- Apply updates.
- Test temperatures, memory, storage and stability.
- Document serial numbers, warranties and final specifications.
Recommended Project Workflow
- Plan
- Verify
- Prepare
- Assemble
- Connect
- Start
- Install
- Test
Final Verification Checklist
- All components are compatible.
- No extra motherboard standoffs are present.
- CPU cooler and fans are connected.
- Memory is fully seated.
- Storage devices are detected.
- Motherboard and CPU power cables are connected.
- Graphics card is secured and powered.
- Front-panel controls work.
- The system completes POST.
- BIOS or UEFI detects all hardware.
- Operating system and drivers are installed.
- Updates are applied.
- Temperatures are acceptable.
- Memory and storage tests pass.
- Final hardware records are complete.
Disconnect mains power before changing internal components. Do not
open the power-supply enclosure, and stop testing if you observe
smoke, burning smells, electrical arcing or abnormal heat.
Congratulations!
You have completed Build Your Own Computer.
You can now plan a compatible specification, assemble major components, complete the first startup, configure BIOS or UEFI, install the operating system and drivers, test stability and troubleshoot common hardware problems.
18 Lessons
Completed
Desktop Computer
Built and Configured
100% Progress
Course Completed
Continue maintaining the computer through regular cleaning, updates, temperature checks, storage-health reviews and careful documentation of future upgrades.
