After adding a GPU to a Dell PowerEdge server: • The operating system does not detect the GPU. • Lifecycle Controller (LCC) Diagnostics reports a POST failure. • IDRAC System Event Log shows a GPU power-related error. What action should be performed first for practical troubleshooting?

The combination of symptoms—failure to detect in the OS, a POST (Power-On Self-Test) failure, and a specific GPU power-related error in the System Event Log—strongly indicates a fundamental hardware problem. The most common cause for such issues with a newly installed component is improper physical installation. Reseating the GPU ensures it is correctly inserted into the PCIe slot and that any required auxiliary power cables are securely connected. This is the most practical and logical first troubleshooting step before investigating software or configuration issues.

A. The iDRAC network configuration is unrelated to the server's ability to detect and power a PCIe device during the POST process.
B. A BIOS Thermal Profile is for managing cooling based on performance needs. It would not cause a POST failure or power error upon initial installation.
C. A GPU driver is software that runs within the operating system. It cannot be installed or function if the hardware is not detected at the BIOS/POST level.

- Dell PowerEdge R760 Installation and Service Manual, "Troubleshooting" section, Page 141. General troubleshooting principles for expansion cards advise to "Reseat the expansion card" as a primary step if the card is not detected.

- Dell PowerEdge Servers: PCIe Devices and GPU Installation and Configuration Guide, "Troubleshooting" section. This type of guide consistently recommends verifying physical installation, including seating and power connections, as the initial step for any detection or power-related problem with a new GPU.