Chapter: Hardware Maintenance

Chapter: Hardware Maintenance

 

 What is BIOS? Briefly describe the function of BIOS in the computer system?

BIOS (Basic Input/Output System) is a type of firmware stored on a computer’s motherboard that starts and controls the computer when it is first powered on.

It is the first software that runs when you turn on a computer.

Functions of BIOS in a Computer System

1. Power-On Self Test (POST)

  • BIOS checks whether hardware components like RAM, keyboard, storage, and processor are working properly.
  • If any issue is found, it shows an error or beep sound.

2. Booting the Operating System

  • BIOS locates the operating system from storage devices (HDD/SSD).
  • It loads the operating system into memory so the computer can start working.

3. Hardware Initialization

  • BIOS activates and configures essential hardware components.
  • Ensures CPU, RAM, keyboard, mouse, and storage devices are ready to use.

4. Provides Basic Input/Output Services

  • BIOS helps the computer communicate with basic devices like keyboard, monitor, and storage before the OS loads.

5. BIOS Setup Utility

  • Allows users to configure system settings like:
    • Boot order
    • System time and date
    • Hardware settings
    • Security settings (like passwords)

Differentiate CRT, LCT, LED, and Plasma in terms of their technology, power consumptioon, size, costing , image quality, speed,k resolution, usability etc.

Difference between CRT, LCD, LED, and Plasma

1. CRT (Cathode Ray Tube)

CRT

  • Technology: Electron beam scans phosphor screen
  • Power consumption: Very high
  • Size/Weight: Very bulky and heavy
  • Cost: Low (older devices, now obsolete)
  • Image quality: Good in older times, but less sharp
  • Speed/Response: Fast response but flickering possible
  • Resolution: Limited compared to modern displays
  • Usability: Obsolete, rarely used today

2. LCD (Liquid Crystal Display)

LCD

  • Technology: Liquid crystals with CCFL/LED backlight
  • Power consumption: Low to medium
  • Size/Weight: Thin and lightweight
  • Cost: Moderate
  • Image quality: Better than CRT, but limited contrast
  • Speed/Response: Moderate (may show motion blur)
  • Resolution: Good (HD and Full HD common)
  • Usability: Widely used in monitors, laptops

3. LED (Light Emitting Diode Display)

LED Display

  • Technology: LCD with LED backlight
  • Power consumption: Very low
  • Size/Weight: Very thin and lightweight
  • Cost: Slightly higher than LCD
  • Image quality: Excellent brightness, contrast, and color
  • Speed/Response: Fast
  • Resolution: Very high (Full HD, 4K, 8K supported)
  • Usability: Most common in modern TVs, monitors, laptops

4. Plasma Display

Plasma Display

  • Technology: Ionized gas (plasma) cells produce light
  • Power consumption: High
  • Size/Weight: Heavy and thick
  • Cost: High
  • Image quality: Very good contrast and deep blacks
  • Speed/Response: Very fast (good for motion video)
  • Resolution: Good, but mostly limited to large screens
  • Usability: Mostly discontinued, used in large TVs earlier

Comparison Table

Feature

CRT

LCD

LED

Plasma

Technology

Electron beam

Liquid crystals

LCD + LED backlight

Ionized gas cells

Power consumption

Very high

Low

Very low

High

Size/Weight

Bulky

Thin

Very thin

Heavy

Cost

Low

Moderate

Moderate/high

High

Image quality

Average

Good

Excellent

Very good

Response speed

Fast

Medium

Fast

Very fast

Resolution

Low/medium

Good

Very high

Good

Usability

Obsolete

Common

Most widely used

Mostly obsolete

Conclusion

  • CRT → Old, bulky, obsolete
  • LCD → Basic modern flat display
  • LED → Improved LCD, best balance of quality and power efficiency
  • Plasma → Excellent quality but high power, now rarely used

 

What are the basic network troubleshooting command in windows OS? Explain in breif?

1. ping

ping command

  • Used to check whether another device (like a server or website) is reachable.
  • Sends small data packets and measures response time.

Example:

ping google.com

✔ Shows if internet is working and response time.

2. ipconfig

ipconfig command

  • Displays IP address, subnet mask, and default gateway.
  • Helps to check network configuration.

Example:

ipconfig

✔ Used to find your system’s IP address.

3. ipconfig /release and ipconfig /renew

  • release: disconnects current IP address
  • renew: gets a new IP address from DHCP server

✔ Used when network is not working properly.

4. ipconfig /flushdns

ipconfig /flushdns

  • Clears stored DNS records.
  • Helps fix website loading issues.

5. tracert

tracert command

  • Shows the path data takes to reach a server.
  • Helps identify where delay or failure occurs.

Example:

tracert google.com

6. netstat

netstat command

  • Shows active connections and open ports.
  • Useful for detecting suspicious network activity.

7. nslookup

nslookup command

  • Checks domain name to IP address mapping.
  • Helps diagnose DNS problems.

Example:

nslookup google.com

Summary

These Windows networking commands help in:

  • Checking connectivity (ping)
  • Viewing IP settings (ipconfig)
  • Diagnosing DNS issues (flushdns, nslookup)
  • Tracing network path (tracert)
  • Monitoring connections (netstat)

What are steps of troubleshooting input/output device when tye stop working after connected to the computer.

Steps to Troubleshoot Input/Output Devices Not Working

When an input/output (I/O) device (like keyboard, mouse, printer, scanner, speaker, monitor) stops working after being connected to a computer, follow these troubleshooting steps:

1. Check Physical Connections

  • Ensure the device is properly plugged in (USB, HDMI, audio jack, etc.)
  • Try reconnecting the cable firmly
  • Check for loose or damaged wires

✔ Example: Replug a USB mouse into another port

2. Check Power Supply (if applicable)

  • Make sure the device is turned ON
  • Check batteries (wireless devices)
  • Verify power adapter is working

✔ Example: Printer not working due to no power

3. Restart the Computer

system reboot

  • Many device issues are fixed after restarting
  • Helps reload drivers and system settings

4. Check Device in Settings / Device Manager

Device Manager

  • Open Device Manager to see if the device is detected
  • Look for yellow warning signs or disabled devices
  • Enable or update the device driver if needed

5. Update or Reinstall Drivers

device driver

  • Outdated or corrupted drivers can cause failure
  • Update drivers or uninstall and reinstall them

6. Test Device on Another Computer

  • Connect the device to another system
  • If it works there, the problem is with your computer
  • If not, the device may be faulty

7. Check Software/Application Settings

  • Ensure correct device is selected in settings
  • Example: printer not set as default printer
  • Check volume or input settings for audio devices

8. Scan for Hardware Conflicts or Errors

  • Check for system error messages
  • Look for conflicts in Device Manager
  • Run Windows troubleshooting tools

9. Replace or Repair Device

  • If none of the above works, the device may be damaged
  • Repair or replace faulty hardware

Summary

Troubleshooting I/O devices involves checking connections, power, system settings, drivers, and hardware health step by step until the issue is identified and fixed.

How do you add or remove hardware and software in windows OS? Explain in brief

Adding or Removing Hardware and Software in Windows OS (Brief)

In Windows Operating System, hardware and software can be added or removed using built-in tools and settings.

1. Adding Hardware in Windows

When a new device (like printer, keyboard, mouse, scanner) is connected, Windows usually detects it automatically.

Steps:

  • Connect the hardware device to the computer (USB, Bluetooth, etc.)
  • Windows automatically installs drivers if available
  • If not, install using driver CD or download from manufacturer website
  • Confirm installation in Device Manager

Device Manager

  • Used to check if the device is properly installed or to update drivers

Removing Hardware in Windows

Steps:

  • Go to Device Manager
  • Select the device you want to remove
  • Right-click → Uninstall device
  • Safely disconnect the hardware

✔ Example: Removing a printer or USB device

2. Adding Software in Windows

Software can be installed in different ways:

Methods:

  • Using setup file (.exe or .msi)
  • Microsoft Store
  • CD/DVD installation

Steps:

  • Download or insert installation file
  • Run the setup program
  • Follow installation wizard instructions
  • Click Finish to complete installation

3. Removing Software in Windows

Uninstalling removes unwanted programs from the system.

Steps:

  • Go to Control Panel or Settings
  • Open Apps / Programs
  • Select the software
  • Click Uninstall

Control Panel

  • Used to manage installed programs and system settings

Summary

Task

Process

Add Hardware

Connect device → Install drivers → Device Manager check

Remove Hardware

Device Manager → Uninstall → Disconnect

Add Software

Run setup file → Install wizard

Remove Software

Control Panel/Settings → Uninstall

Conclusion

In Windows OS, adding or removing hardware is managed mainly through Device Manager, while software is handled through Control Panel or Settings, making system management simple and user-friendly.

 

What do you mean by data backup? Describe the idea technologies and procedures of data backup in the lastest technology schenario.

What is Data Backup?

Data backup is the process of creating and storing a copy of important data so that it can be recovered in case of:

  • accidental deletion
  • hardware failure
  • cyber attacks (like ransomware)
  • system crashes or disasters

👉 In simple terms: Backup means making a safe copy of your data for future recovery.

Idea / Importance of Data Backup

The main idea of backup is:

  • To ensure data safety and availability
  • To support quick recovery after data loss
  • To protect against cyber threats and system failure
  • To maintain business continuity

Modern Technologies Used in Data Backup

1. Cloud Backup

Cloud Backup

  • Data is stored on remote servers via internet
  • Accessible from anywhere
  • Automatic backup option available

✔ Examples: Google Drive, OneDrive, Dropbox

2. External Storage Backup

External Hard Drive

  • Uses USB drives, external HDDs, SSDs
  • Easy to use and fast access
  • Requires physical safety

3. Network Attached Storage (NAS)

NAS (Network Attached Storage)

  • Centralized storage system for organizations
  • Multiple users can access and store data
  • High speed and secure

4. Hybrid Backup System

Hybrid Backup

  • Combines cloud + local storage
  • Provides faster recovery and high security
  • Most commonly used in modern systems

Backup Procedures (Steps)

1. Identify Important Data

  • Select files, databases, and system data to back up

2. Choose Backup Type

  • Full backup (complete data copy)
  • Incremental backup (only new changes)
  • Differential backup (changes since last full backup)

3. Select Backup Location

  • Cloud storage
  • External drive
  • NAS or server

4. Schedule Automatic Backup

  • Set daily, weekly, or real-time backup
  • Reduces human error

5. Perform Backup and Verify

  • Run backup process
  • Check if data is stored correctly

6. Data Recovery Testing

  • Test restoring data to ensure backup works properly

Modern Scenario (Latest Trend)

Today, organizations use:

  • AI-based backup systems (automatic detection of important data)
  • Real-time backup (continuous data protection)
  • Cloud + hybrid systems
  • Ransomware protection backups (immutable backups)


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