MODULE 1: Computer Hardware & System Components
MODULE 1: Computer Hardware & System Components
This module builds the technical foundation every IT Support Technician must master. Before fixing software or networks, you must first understand the physical machine itself.
By the end of this module, students will clearly understand how a computer works from the inside, how to assemble it, and how to diagnose basic hardware failures.
What You Will Learn in This Module
By the end of Module 1, you will be able to:
- Identify all major computer hardware components
- Understand the function of each internal part
- Assemble and disassemble a desktop computer safely
- Explain the boot process from power button to operating system
- Access and configure BIOS/UEFI
- Detect and troubleshoot common hardware failures
- Upgrade RAM, storage, and other components confidently
Lesson 1: Introduction to Computer Hardware
What Is Computer Hardware?
Computer hardware refers to the physical parts of a computer system everything you can see and touch.
Examples:
- Desktop & laptop casing
- Monitor, keyboard, mouse
- Internal components like CPU, RAM, storage
Hardware works together with software (Windows, Linux, applications) to perform tasks.
Categories of Hardware
- Input Devices – keyboard, mouse, scanner
- Output Devices – monitor, printer, speakers
- Processing Devices – CPU, GPU
- Storage Devices – HDD, SSD, USB drives
- Power Devices – PSU, battery
Lesson 2: Internal Computer Components (Deep Explanation)
This lesson breaks down the core internal parts of a computer.
- Central Processing Unit (CPU) — The Brain
- Performs all calculations and instructions
- Controls every operation inside the computer
- Speed measured in GHz
- Types: Dual-core, Quad-core, Hexa-core, etc.
Common Issues:
- Overheating
- Slow performance
- System shutdown under load
IT Support Tip: Always use thermal paste and proper cooling.
- Random Access Memory (RAM) — Short-Term Memory
- Temporarily stores data being actively used
- More RAM = better multitasking
- Measured in GB (4GB, 8GB, 16GB, etc.)
Common Issues:
- Blue screen
- System freezing
- Failure to boot
- Storage Devices — Long-Term Memory
HDD (Hard Disk Drive)
- Mechanical storage
- Slower but cheaper
SSD (Solid State Drive)
- No moving parts
- Much faster boot and performance
IT Support Tip: Always recommend SSD for system drive.
- Motherboard — The Communication Hub
- Connects all components
- Determines:
-
- CPU type
- RAM type
- Expansion slots
- Storage ports
- If motherboard fails → system fails completely
- Power Supply Unit (PSU) — The Heart
- Converts AC power into DC power
- Powers all components
- Measured in Watts (W)
Common PSU Failure Signs:
- PC not powering on
- Sudden shutdowns
- Burning smell
- Graphics Processing Unit (GPU)
- Handles graphics & video rendering
- Built-in (integrated) or dedicated (external)
- Important for:
-
- Design
- Gaming
- Video editing
- Cooling System
- CPU fan
- Case fans
- Liquid cooling (advanced)
Prevents:
- Overheating
- CPU damage
- Sudden shutdown
Lesson 3: Desktop vs Laptop Hardware
| Feature | Desktop | Laptop |
| Upgradability | High | Limited |
| Portability | Low | High |
| Repair cost | Low | High |
| Cooling | Better | Limited |
| Performance | Higher | Limited by heat |
IT Support Role: Know what can & cannot be upgraded on each.
Lesson 4: Power, Booting & POST Process
Power Flow
- Power button pressed
- PSU sends power to motherboard
- CPU activates
- BIOS/UEFI initializes hardware
POST (Power-On Self-Test)
Checks:
- CPU
- RAM
- Storage
- Keyboard
- GPU
If error found → system gives:
- Beep codes
- Error messages
- No display
Lesson 5: BIOS & UEFI (System Firmware)
What Is BIOS/UEFI?
Firmware that controls:
- Boot order
- Hardware detection
- System clock
- Security features
Common BIOS/UEFI Tasks for IT Support
- Change boot device (USB, HDD, SSD)
- Enable/disable secure boot
- Reset BIOS settings
- Enable virtualization
- Set administrator password
Lesson 6: Assembling & Disassembling a computer
Safety First
- Power off
- Unplug PSU
- Discharge static electricity
- Use proper tools
Assembly Steps (Simplified)
- Install CPU
- Attach RAM
- Install motherboard
- Mount PSU
- Connect storage
- Install GPU
- Cable management
- Power test
Disassembly (For Repair)
- Remove external cables
- Remove GPU
- Remove RAM
- Remove storage
- Remove motherboard
Lesson 7: Common Hardware Problems & Troubleshooting
| Problem | Possible Cause |
| PC not turning on | PSU failure |
| No display | RAM/GPU issue |
| Random shutdown | Overheating |
| Slow performance | HDD failure / low RAM |
| Beep sounds | RAM/CPU error |
Basic Troubleshooting Steps
- Visual inspection
- Check power
- Reseat components
- Replace with known-good parts
- Run diagnostics
Lesson 8: Hardware Upgrades (IT Support Skill)
Students learn how to:
- Add more RAM
- Replace HDD with SSD
- Upgrade PSU
- Replace faulty fans
- Install new GPU safely
MODULE 1 SUMMARY
By completing Module 1, students now understand:
- All major internal computer components
- How power & booting works
- How to access BIOS/UEFI
- How to assemble & disassemble PCs
- How to detect basic hardware faults
- How to perform safe hardware upgrades
This module answers the most important IT Support question:
“What is inside the computer, and how do I fix it when it fails?”