An administrator has just upgraded a server from non-hot plug storage to all hot plug storage. The administrator powers up the server, during POST the RAID controller is recognized but none of the…

The backplane is the physical interface board that connects hot-plug drives to the RAID controller; after replacing non-hot-plug with hot-plug storage, the cabling between the backplane and the controller may be loose, disconnected, or incompatible, which would prevent any drive from being recognized or lighting up during POST.

The BIOS manages system-level hardware initialization but does not directly govern RAID drive detection or backplane communication, making it an unlikely cause when the controller itself is already recognized.

Firmware updates address software-level bugs and compatibility issues, but a firmware problem would not cause all drive lights to go dark when the controller is already detected during POST.

Hard drive firmware issues would not prevent the drives from being seen at all during POST detection, and firmware cannot be updated on drives the system cannot yet recognize.