The power supply unit—or PSU—is a foundational component, and this episode explains how its failure can lead to a wide range of confusing symptoms. We begin with the most obvious issue: a system that won’t power on. You’ll learn how to check for power delivery at the outlet, wall cord, and mainboard connectors, and when to use multimeters or PSU testers.

We also cover reboot loops caused by unstable voltage, audible whining or buzzing from damaged capacitors, and the risks of using low-quality power supplies in high-performance systems. CompTIA frequently includes questions about power supply sizing, rail voltage, and connector types, and this episode prepares you to answer all of them. Brought to you by BareMetalCyber.com.