As earlier said, the entire process is about identifying what is wrong. Is something not working as it should? Is your device showing any errors, or does it not even start? There are important things that are part of the computer repair process that will help you identify what you deal with, and based on that, you can start implementing the changes that must be made. Experts in this field have certain steps they follow, and stick to them as that makes their work easier. Something that helps them is being familiar with the devices they need to fix.