Bootmgr is missing - No OS found

Rezident

Rezident

Rezident

Soldato
Joined
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Windows 7 update just now, needed a restart, after restart "bootmgr is missing" hit ctrl + alt + del. Tried repair but no OS is showing up so there's no OS to repair. Tried bootrec /fixboot (element not found) and bootrec.exe /fixmbr - says the operation completed successfully but doesn't actually fix it.

When I click load drivers I can see all my drives are there and can access them all, even the windows install is there. Any other fixes or ideas why windows update would do this?
 
Last edited:
Strange issue to get after installing updates. You could perhaps try running check disk from a command prompt (from the startup repair options).
 
Yep forgot to say no new hardware or anything, just Windows automatic update! It's like vista all over again. Ok I'll try that thanks.
 
Ok the AutoChk in startup repair found a root cause:
The partition table does not have a valid System Partition.

Must be why W Repair can't find an OS even though I can see the drives and files are still there.

Startup repair says:
Repair action: partition table repair
Result: completed successfully.

But after reboot I still get bootmgr missing. Its progress anyway, what else might work?

Tried bcdboot d:\windows but got "failure when attempting to copy boot files".
 
If you have another PC you can connect your hard drive to it via a caddy and use Testdisk to rebuild the partition table (be sure you make it primpary bootable). Came across this problem a few times in work.
 
No oc and I've already verified all drives are working. I will test the memory next but there must be some way to repair the mbr that had mysteriously corrupted itself?
 
Hm when I run windows memory diagnostic it says:
Windows cannot check for memory problems
An error is preventing windows from checking for memory problems during startup.

Really don't want to do a fresh install, any other ideas? I'll try anything at this stage.
Thanks.
 
Hi,

Do you have a Windows installation disc or Repair Disc? Want to know before changing the active partition so you can get back to diskpart from DVD if needed.

Get some information about which partition is active and post the number.

From the list of five options ending with command prompt choose command prompt. Type and hit <enter> after these commands:
diskpart
select disk 0
list volume (post the volume letters and sizes--just the ones of type NTFS)
list partition

Now select each partition and look at the details for the Active status (it will be, yes or no) You can skip to exit when you find the Active partition because there can be only one.

select partition 1
detail partition
select partition 2
detail partition
select partition 3
detail partition
exit
 
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