This document provides definitions and examples of preventive maintenance. It defines preventive maintenance as maintaining equipment through systematic inspection, detection, and correction of issues before they become major failures. This is contrasted with corrective maintenance. The document then provides some examples of common computer issues and their solutions, such as how to fix a hard disk not being detected or speakers not working. It suggests troubleshooting steps like checking BIOS settings or audio jack connections. Overall, the document defines preventive maintenance and gives examples of addressing typical computer problems.