Computer Assembly II SS1 Computer Hardware & GSM Repair Lesson Note

This is the final stage of bringing a computer to life. If the previous lesson was about building the “body,” this lesson is about giving the computer its “personality” and telling it how to behave.

Once the parts are screwed in, the computer is still just a “dumb” box. We need to wake it up and give it instructions.

The First Breath – What is the BIOS?

BIOS stands for Basic Input/Output System. It is a tiny bit of software that lives on a chip on the motherboard. It is the very first thing that wakes up when you press the power button.

Think of the BIOS like a security guard at a school gate. Before anyone (like Windows) can enter, the guard checks if everyone is present.

• Is the RAM there?
• Is the Keyboard plugged in?
• Is the CPU too hot?

If the “security guard” finds a problem, the computer will often make a Beep sound to warn you.

Entering and Setting Up the BIOS

To talk to this “security guard,” you have to be fast! As soon as you turn on the computer, you usually have to tap a key on the keyboard repeatedly—usually F2, F10, or the Delete key.

What do we actually do in the BIOS?

1. Check Date and Time: If the time is wrong, some websites won’t open later.
2. Monitor Health: We check the temperature of the CPU to make sure our fans are working.
3. Set Boot Priority: This is the most important part! We tell the computer: “Don’t look at the empty Hard Drive yet; look at my USB Flash Drive to find the new Operating System.”

What is an Operating System (OS)?

The Operating System is the “Manager” of the computer. It is the software that allows you to see icons, move the mouse, and run apps. Without an OS, you would just see a black screen with white text.

Common Operating Systems:

• Windows: The most popular one for laptops and offices.
• macOS: Used on Apple computers.
• Linux: A free system often used by programmers.
• Android: The OS for most of our GSM phones.

Function: The OS translates your clicks and taps into commands that the hardware can understand.

The Basics of OS Installation

To install an OS (like Windows), you usually need a Bootable USB Drive. This is a flash drive that has the “installer” files inside.

The Step-by-Step Flow:

1. Plug in the USB: Put it in the computer while it’s off.
2. Boot from USB: Use the BIOS (from Page 2) to tell the computer to start from the USB.
3. The Wizard: A “Setup Wizard” will appear. It’s like filling out a form. It will ask:
   1. “What language do you speak?”
   2. “Which Hard Drive should I stay on?”
4. Formatting: The installer will “clean” the Hard Drive to make it ready for the new files.

Important Note: Never turn off the computer or pull out the power cord while the OS is installing. If you do, you might “break” the software and have to start all over again!

Finishing Touches (Drivers and Updates)

Once the OS is installed, you aren’t quite finished. You might notice the screen looks a bit blurry or the Wi-Fi isn’t working. This is because you need Drivers.

What is a Driver? A Driver is a small manual that tells the OS exactly how to use a specific piece of hardware.

• The OS knows it has a “Screen,” but the Graphics Driver tells it how to make that screen look sharp and colorful.
• The OS knows there is a “Sound Card,” but the Audio Driver tells it how to play music.

Conclusion: Building a computer is a 50/50 job. 50% is the physical assembly (Hardware), and 50% is the setup (Software). When both are done right, you have a powerful tool ready for work!

Class Discussion / Practical Quiz

1. If you turn on a computer and it says “Keyboard Not Found,” which part of the system is telling you that?
2. Why do we need to change the “Boot Priority” in the BIOS when we want to install Windows?
3. If your computer is working but you can’t hear any sound, what is the first software “manual” (Driver) you should check?