PC POST is an acronym for Power On Self Test, which is a diagnostic tool used to check the basic functionality of a computer's hardware components. It is typically performed when a computer is first turned on and can detect any potential issues with the hardware. The term PC POST is also used to refer to the process of troubleshooting a computer's hardware components. The crossword solution for PC POST is EMAIL, which stands for Electronic Mail. Email is a form of digital communication that allows users to send and receive messages electronically.