You are at a customer site to service an HP Z420 Workstation that will not power-on. What should you do next?

Running the power supply Built-In Self-Test (BIST) is the appropriate next step when faced with a power issue in the HP Z420 Workstation. This test allows to quickly assess whether the power supply unit (PSU) is functional or if it is potentially the source of the problem. The BIST is designed to provide immediate feedback, indicating whether the power supply is delivering power to the motherboard and other components. By initiating this self-test, you can effectively pinpoint the fault without prematurely removing hardware or assuming that the power supply is at fault.

This method is efficient because it helps avoid unnecessary steps, such as removing the power supply and ordering replacements, which can lead to extended downtime for the customer. It also allows for troubleshooting that is grounded in direct testing rather than assumptions. Furthermore, navigating warranty and support protocols may involve additional steps that can delay service, making BIST the more practical approach for immediate diagnosis at the customer's site.