Drive will not boot after 1709 upgrade

Looks like yet another failed Windows 10 Upgrade. After the "forced" upgrade to 1709 the computer now boots with a black screen "Bootmgr is Missing". The drive is intact. I can boot a rescue CD and see it. Directories and all. It just won't boot. Any ideas on how to salvage this and make it bootable?
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JohnBusiness Consultant (Owner)Commented:
Can you boot to Safe Mode?  Shut down, start up (I know it does not boot), restart and then immediately press F8 repeatedly. Can you get to Safe Mode?

If so, restore to a prior point and update BIOS, Chipset and Video.

If not, can you update drivers (above) from the Rescue CD?
Brian McDonaldIT ManagerCommented:
Can you check the bios is the machine set to boot UEFI? Did it get switched to legacy by accident?
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Shaun VermaakTechnical SpecialistCommented:
Do you have two drives?
LockDown32OwnerAuthor Commented:
This whole Windows 10 trip I'd rather not re-live. Microsoft did a really, really horrid job. The boot partition lost the active status so I had to boot a utility cd and re-establish the active partition. The it would only boot to diagnostics mode. Finally when I went in to Safe Mode did it "couldn't install updates. Reverting" and lo and behold it booted.....

until I ran updates again. I download the cumulative just after the 1709 upgrade and not boots in to diagnostics mode. Nice job M$. Great operating system. Vista II......

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JohnBusiness Consultant (Owner)Commented:
Microsoft did a really, really horrid job.

I know that is your experience, but that is not our experience here at all.

Finally when I went in to Safe Mode did it "couldn't install updates. Reverting" and lo and behold it booted.....

So you were able to get into Safe Mode and go back and then boot.  That is good news.
LockDown32OwnerAuthor Commented:
I am glad you aren't having any issues with Windows 10. You are one of the few.
JohnBusiness Consultant (Owner)Commented:
I asked you to try Safe Mode and go back. You said you did. Why are you accepting what I asked you to do as your solution?
LockDown32OwnerAuthor Commented:
You said go in to safe mode and do a restore. I did not do that.
JohnBusiness Consultant (Owner)Commented:
I think I assisted you and that was my point . However if my advice did not halo you , carry on
LockDown32OwnerAuthor Commented:
It was the solution
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