How could you diagnose the defects in computer?

To diagnose defects in a computer, start by observing the symptoms and error messages, which can provide clues about the issue. Use built-in diagnostic tools and software to run hardware tests, checking components like the CPU, RAM, and hard drive for errors. Additionally, inspect physical connections and components for any visible damage or loose connections. If issues persist, consider consulting the manufacturer's documentation or seeking professional assistance for complex problems.