POST_OUT refers to a diagnostic signal output from a computer’s CPU or motherboard during the Power-On Self-Test (POST) process. This signal is often used by technicians and hardware enthusiasts to monitor the status of the system as it initializes hardware components during startup. By analyzing the POST_OUT signal, users can identify hardware issues, troubleshoot boot failures, and even modify system behavior for advanced configurations or overclocking. POST_OUT is particularly valuable in custom PC building, motherboard development, and hardware modding, as it provides direct feedback about the system’s initialization sequence, making it easier to pinpoint faults or misconfigurations.