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Win 10 Pro System Disk Failure/ Restored, and now will not boot "NTLDR is missing"

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I'm using Acronis 2018. 

Today my office PC running Window 10 Pro failed to boot up.  Investigation found that system disk was damaged.  I removed it and put in another, temporarily until I could get a new one.

I restored using a Acronis 2018 bootup CD from a backup taken about 2 months ago (maybe 2017??).  The backup process seemed to go ok and I got the "successful" message.

However, when I try to bootup I now get "NTLDR IS MISSING" message.   

I have removed the drive and reformatted it. Reinstalled and restored.  I get the same result "NTLDR IS MISSING".

What have I done wrong and what can I do now?

Thanks....RDK

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Have you updated any of the settings in the BIOS to reflect the change of drive?

What type of BIOS do you have, is it Legacy or UEFI (with/without Secure Boot)?

Was your backup image that you restored for a full disk & partitions that included all hidden/system partitions?

Can you check your failing drive to see if you have an EFI partition or not?

Thanks for the quick reply:

Have you updated any of the settings in the BIOS to reflect the change of drive?

Yes, I went into the BOIS and identified the boot drive in the boot order

What type of BIOS do you have, is it Legacy or UEFI (with/without Secure Boot)?

The PC is a box I built about 5 years ago, probably for Windows 7 Pro .  How do I tell what kind of BIOS I have?

Was your backup image that you restored for a full disk & partitions that included all hidden/system partitions?

Not sure I understand, I did the restore using the boot-up CD.  It was a partition restore including the MBR.

Can you check your failing drive to see if you have an EFI partition or not?

 When I looked at the drives in that box using Acronis Disk manager 12, it indicated that it was undefined, so something like that.

Thanks again....RDK

When you go into the BIOS, if it is UEFI then you would see Windows Boot Manager as the boot device as opposed to seeing the disk drive itself, assuming that the boot mode was UEFI.

If you do have a UEFI system, then the boot CD would need to also be booted from a UEFI boot option.

See KB 59877: Acronis True Image 2017: how to distinguish between UEFI and Legacy BIOS boot modes of Acronis Bootable Media  which shows the differences that you may see.

See forum topic: [How to] recover an entire disk backup (from the 2017 forum) which shows the difference between recovering at a disk level versus at a partition one. 

Steve....Thanks again for you comments.  Your comment about Disk vs Partition restore gave me a clue to my problem.  I just finished restoring the DISK and not just the Windows system partition.  Now boots up normally.

Now to try to recover missed updated, etc.

Thanks again.....RDK

Glad the advice was helpful and that your system is working again.