15 Common Computer Problems You Can Fix Yourself – Complete Troubleshooting Guide

Computers are an essential part of our daily life, but technical problems can happen at any time. A slow PC, Wi-Fi connection problem, printer not responding, USB device not detected, or Windows/Ubuntu boot problem can interrupt your work.

The good news is that many common computer problems can be diagnosed and fixed without visiting a service center.

In this guide, CBR Drive explains 15 common computer problems and practical solutions that every Windows and Linux user should know.

1. Computer Is Running Very Slow

If your computer has become slow, first check which applications are consuming system resources.

Windows

Press:

Ctrl + Shift + Esc

to open Task Manager.

Check:

CPU usage
Memory usage
Disk usage
Startup applications

Disable unnecessary startup programs.

Ubuntu/Linux

Open Terminal and run:

top

or:

htop

If htop is not installed:

sudo apt install htop

Remove unnecessary applications and keep sufficient free disk space.

2. Wi-Fi Connected but Internet Is Not Working

First check whether the problem is with your computer or the network.

Try:

ping 8.8.8.8

If this works but websites don't open, the problem may be related to DNS.

You can also try:

ping google.com

If the first command works but the second fails, check your DNS configuration.

For Windows, restarting the network adapter and router can also resolve temporary connection problems.

3. Internet Is Very Slow

Check these things:

Restart the router.
Test another device.
Move closer to the Wi-Fi access point.
Check whether many devices are connected.
Test using an Ethernet cable.
Check your internet speed.

If only one computer is slow, the issue is probably local to that computer rather than the internet connection.

4. Printer Is Not Detected

If your printer is connected to the same LAN but cannot be detected:

Check the printer IP address

Print the printer's network configuration page.

Then test:

ping PRINTER-IP

Example:

ping 192.168.1.50

If there is no response, check:

Network cable/Wi-Fi
Printer network settings
Router connection
IP address
Firewall

For network printers, using a fixed/reserved IP address can make administration easier.

5. USB Pendrive Is Not Detected

Try the following:

Disconnect and reconnect the USB drive.
Try another USB port.
Test the drive on another computer.
Check Disk Management in Windows.
Check connected devices in Linux.

Ubuntu users can run:

lsusb

To check disks:

lsblk

If the device appears but has no mounted partition, the issue may be related to the filesystem or partition table.

Important: Do not format the drive before checking whether important data is stored on it.

6. Computer Does Not Boot

If the PC does not start:

Check the basics

Power cable
Monitor cable
Keyboard/mouse
RAM
Storage device
BIOS/UEFI settings

If you recently changed hardware, return the system to its previous configuration and test again.

For Windows systems, check whether the boot drive is visible in BIOS/UEFI.

7. Bootable USB Is Not Detected

If a Windows or Linux installation USB is not detected:

Enter BIOS/UEFI.
Check whether USB boot is enabled.
Check Boot Order.
Try another USB port.
Recreate the bootable USB.
Check UEFI/Legacy compatibility.

For modern systems, UEFI + GPT is generally the preferred configuration when supported by the operating system and hardware.

8. Windows Takes Too Long to Start

Open:

Task Manager → Startup Apps

Disable programs that don't need to start automatically.

Also check:

Available disk space
Windows updates
Background applications
Storage health
Malware/security scans

Avoid disabling Windows system components unless you know exactly what they do.

9. Ubuntu Is Running Out of Disk Space

Check available storage:

df -h

To find large directories:

du -h --max-depth=1 ~

You can also clean unused package files:

sudo apt autoremove

and:

sudo apt clean

Always check what will be removed before deleting important files manually.

10. Website Is Not Opening

If one website does not open, try:

Refreshing the page
Incognito/private mode
Another browser
Clearing browser cache
Restarting the network connection
Testing another device

If you see an error such as:

ERR_CONNECTION_TIMED_OUT

test another website first.

If every website fails, investigate the network connection rather than the individual website.

11. DNS Problems

DNS converts domain names such as:

google.com

into IP addresses.

Test DNS with:

nslookup google.com

or:

dig google.com

On Windows:

nslookup google.com

If DNS resolution fails while internet connectivity works by IP address, investigate the DNS configuration.

12. PC Cannot Connect to a Network Printer

A very common office problem is that one printer works while another printer on the same LAN cannot be added.

Check:

ping PRINTER-IP

If the printer responds, try adding it manually using its IP address.

Also check whether the printer and computer are actually on the same network/VLAN.

For offices with multiple access points, confirm that client isolation or wireless segmentation is not preventing communication.

13. System Becomes Slow After Installing Software

Recently installed software can sometimes introduce:

Background services
Startup programs
Browser extensions
High CPU usage
High memory usage

If the problem started immediately after an installation, uninstalling the recently added software can be a useful diagnostic step.

14. How to Quickly Check Your PC's IP Address

Windows

Open Command Prompt:

ipconfig

Look for:

IPv4 Address

Ubuntu/Linux

Run:

ip addr

or:

hostname -I

This is one of the most useful commands for troubleshooting LAN and printer problems.

15. The Most Important Troubleshooting Rule

When troubleshooting a computer problem, don't change many things at once.

Use this simple process:

Identify → Test → Isolate → Fix → Verify

For example:

Internet not working

→ Test another device
→ Test the router
→ Test the computer
→ Test IP connectivity
→ Test DNS
→ Identify the failing component
→ Apply the fix
→ Test again

This approach prevents unnecessary changes and makes technical problems much easier to solve.

Quick Troubleshooting Command Cheat Sheet

Purpose	Windows	Ubuntu/Linux
IP address	`ipconfig`	`ip addr`
Test connection	`ping`	`ping`
DNS test	`nslookup`	`nslookup` / `dig`
Network information	`ipconfig /all`	`ip addr`
Running processes	Task Manager	`top` / `htop`
Disk information	Disk Management	`lsblk`
USB devices	Device Manager	`lsusb`
Disk space	File Explorer	`df -h`
Route information	`tracert`	`traceroute`

Final Thoughts

You don't need to be an IT expert to solve many everyday computer problems.

Learning a few basic commands, understanding IP addresses, checking hardware connections, and following a systematic troubleshooting process can save significant time.

Whether you use Windows, Ubuntu, or another operating system, the most important skill is not memorizing hundreds of commands—it is learning how to identify the problem step by step.

Follow CBR Drive for practical computer troubleshooting, networking, Linux, Windows, software, hardware, and technology guides.

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Thursday, 24 September 2026