We have a server that is showing the the Boot Selection Failed Required Device Is Inaccessible after our onsite tech had replaced the secondary drive in one of our servers. The drive that went back was the extended drive not the boot drive. However after replacing the drive it is now throwing this error. We had the tech remove the secondary drive and only try and boot from the main drive with the OS same result. Both drives are seen in bios and throwing the same error even with UEFI on or off. Is there anyway to repair this, seeing that the onsite tech doesnt have a replacement disk to run a recovery? Or is that the only answer? The OS is server 2008 r2 running 1 individual drives with no raid. The unit was booting just fine until they tried and replaced the bad drive in the unit.