An administrator just installed a new RAID controller card into a server. The firmware is current for the controller card. When the server is powered up the administrator notices that the RAID…

Incorrectly plugged-in hard drives would prevent the RAID array from being detected or functioning correctly, but the RAID controller card itself would still be recognized during POST.

Controller drivers are operating system level software and are not relevant during the server's Power-On Self-Test (POST), where hardware recognition occurs at the firmware level.

If the server's BIOS/UEFI firmware is outdated, it may lack the necessary microcode or support for newer hardware like a recently installed RAID controller card, causing it not to be recognized during the Power-On Self-Test (POST). Updating the server firmware is often required for new hardware compatibility.

A disconnected cable from the controller to the hard drive backplane would prevent the RAID controller from communicating with drives, but the controller card itself would still be recognized during POST.