No Power? Learn about Dell’s Built In Self Test for power supplies (00:02:56) Watch this introductory guide for troubleshooting and isolating power issues in newer Optiplex and Precision Workstation desktop systems. Many desktops are now configured with a Built-In Self-Test (BIST) for the power supply. The BIST can be used to isolate and troubleshoot power failures throughout the system. Closed captions available in many languages.