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Andrew N. Kowtalo

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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.      
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rindi
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You may have to set the correct boot order in the BIOS. If it previously used UEFI, it has to be set to UEFI. Windoze that was Setup for UEFI can only boot in UEFI mode. If it wasn't setup for UEFI, then you can's use UEFI.

Besides that, Windows 2008 r2 has been EOL for quite while now. You must upgrade to a newer OS asap, or you'll system will be open to attacks, as it doesn't get any upgrades any longer.
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Are you SURE the tech replaced the right drive?
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Andrew N. Kowtalo

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@scott positive anther engineer worked on this prior.   He even removed the drive he replaced and left the original.   Somehow the boot loader became corrupt.  
OK I got more clarification he just didnt swap the drive he put in a brand new unit with 2 new drives after I had explained not to do that since the old drive has data on it.   Going to have him take both drives out and place them in the new server and see if that boots.