An expert system is a computer program designed to model the problem-solving ability is what an expert. Expert systems are the author of this wake is a system that is seen as a tool to facilitate the user in handling the laptop hardware damage. Searches can be done if there are already rules on the system. This expert system is designed to work like an expert that determines the outcome uncertain, as is done by an expert. This expert system requires enter traits such damage. This application was built using Microsoft Visual FoxPro 9.0. Data analysis technique used is the Unified Modeling Language (UML). Application of the method certainty factor for determining the value of certainty. The study design used by the author is a descriptive study design. Data collection is done by studying literature and from the internet. Applications to diagnose laptop hardware damage wake writer is expected to assist and facilitate computer technicians and users who want to know the causes and solutions of damage.