Bootmgr is corrupt, Computer doesn't recognize the Windows 10 Installation USB-Stick and won't start BIOS/show the Key for it

Firestar97

Firestar97
Windows 10 System Repair did what it can best again. It killed a important File
IMG_20210725_121058.jpg


How can I fix this?
Edit: just forgot that my trashy new Keyboard doesn't want to work before the System is started, so I just connected my old one and now it works

Ive used chkdsk but it still shows the Error after restarting. Is there a Way to fix it without needing to reinstall everything?
 
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bangermsuk

bangermsuk
no problem. i had the same thing when i changed my default hdd to m2.dot drive has master bootable disk.
bootrec : fixs the mbr disk.
www.minitool.com

What Is Bootrec.exe? Bootrec Commands and How to Access - MiniTool

This article displays some information about Bootrec.exe in detail to help you solve the startup issues when Startup Repair in Windows RE is not working.
www.minitool.com www.minitool.com

  • bcdedit/export C:\BCD_Backup
  • c:
  • cd boot
  • attrib bcd -s -h -r
  • ren c:\boot\bcd bcd.old
  • bootrec /rebuildbcd
 
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Firestar97

Firestar97
bangermsuk said:
no problem. i had the same thing when i changed my default hdd to m2.dot drive has master bootable disk.
bootrec : fixs the mbr disk.
www.minitool.com

What Is Bootrec.exe? Bootrec Commands and How to Access - MiniTool

This article displays some information about Bootrec.exe in detail to help you solve the startup issues when Startup Repair in Windows RE is not working.
www.minitool.com www.minitool.com

  • bcdedit/export C:\BCD_Backup
  • c:
  • cd boot
  • attrib bcd -s -h -r
  • ren c:\boot\bcd bcd.old
  • bootrec /rebuildbcd
Click to expand...
Unplugging the SSD and plugging it back in, at least caused it to not show the Error anymore. But now there's some unknown Error that System Repair can't fix. I'm trying it with the System Repair from my Installation Stick again and hope that this will be able to help. If this doesn't work, I'll try those Commands
 

Firestar97

Firestar97
It's always denying Access when I try the Command fixboot.
I assume if I could use this, it would probably fix it.
The SrtTrail File also isn't very useful

Important Information, I forgot to add: my OS is Windows 10 professional
 
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bangermsuk

bangermsuk
How to fix Windows 10 startup access denied?
  • 1 Boot from Windows 10 installation disc and press any key to continue. 2 Then navigate to Repair your computer -> Troubleshoot -> Advanced options -> Startup Repair. 3 Wait for the result of the automatic repair and follow the instructions to solve problems.
 

Firestar97

Firestar97
bangermsuk said:
How to fix Windows 10 startup access denied?
  • 1 Boot from Windows 10 installation disc and press any key to continue. 2 Then navigate to Repair your computer -> Troubleshoot -> Advanced options -> Startup Repair. 3 Wait for the result of the automatic repair and follow the instructions to solve problems.
Click to expand...
Sadly as I've already written Startup Repair doesn't work
 

Firestar97

Firestar97
How can I open the CD Drive in command prompt? I do have a Repair CD that I would like to try but the Button to open it seems to only work once the OS is started
 

finglonger

F
Urufu1997 said:
Unplugging the SSD and plugging it back in, at least caused it to not show the Error anymore. But now there's some unknown Error that System Repair can't fix. I'm trying it with the System Repair from my Installation Stick again and hope that this will be able to help. If this doesn't work, I'll try those Commands
Click to expand...
Urufu1997 said:
Why can't I use chkdsk on X which is the Partition that is needed to boot the Computer?
Click to expand...
if youve got multiple disks in your PC and youve disconnnected one of the disks then its likely the boot sequence in bios has changed, especially if your OS is installed on a disk other than sata0.. youll likely need to change the boot sequence so your booting from the correct disk with the boot loader

if you follow the steps above you rebuild the windows boot loader you need to run additional commands

bootrec /scanOS -this detects the location of all installed versions of windows even if theres only 1
bootrec /rebuildBCD -when you run this command iirc it will then ask you which instances to add or it may just add all instances of windows to the boot loader
ie
  • bcdedit/export C:\BCD_Backup
  • c:
  • cd boot
  • attrib bcd -s -h -r
  • ren c:\boot\bcd bcd.old
  • bootrec /scanOS
  • bootrec /rebuildbcd

if rebuilding the bootloader alone dosent work - youve rebuild the bootloader but windows still wont boot - or you cant work out which order in bios the disks were set then youll need to use the following commands first

bootrec /fixmbr
bootrec /fixbootrec
 
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Firestar97

Firestar97
finglonger said:
if youve got multiple disks in your PC and youve disconnnected one of the disks then its likely the boot sequence in bios has changed
Click to expand...
Only have one SSD in there but I'll take a look at BIOS again.


finglonger said:
bootrec /scanOS -this detects the location of all installed versions of windows even if theres only 1
bootrec /rebuildBCD -when you run this command iirc it will then ask you which instances to add or it may just add all instances of windows to the boot loader
ie
  • bcdedit/export C:\BCD_Backup
  • c:
  • cd boot
  • attrib bcd -s -h -r
  • ren c:\boot\bcd bcd.old
  • bootrec /scanOS
  • bootrec /rebuildbcd
Click to expand...
It just shows that the Search for Windows Installations was successful but it shows 0 as the Number of identified Windows Installations
 

finglonger

F
Urufu1997 said:
Only have one SSD in there but I'll take a look at BIOS again.



It just shows that the Search for Windows Installations was successful but it shows 0 as the Number of identified Windows Installations
Click to expand...
itll be all disks - SSD, HDD, DVD\CD could affect the boot sequence but bootrec /scanOS will find the installed os on any disk regardless of its location, so long as the disk is enabled and recognised in bios

however if you onlly have one disk installed and running bootrec /scanOS finds no installed OS then your install is corrupt beyond repair
running
bootrec /fixmbr
bootrec /fixbootrec
followed by chkdsk /offlinescanandfix
might fix the problem but tbh you are likely looking at a reinstall

you could also try running
diskpart
list volume
exit (when finished)
1627243880573.png

this will list all the disks in your system and hidden partitions used for windows - if you have 1 disk you should see at least 2 partitions - boot and system - there will usualy be a 3rd either marked hidden or recovery. if you see no partitions or no system partition then you need a reinstall
 
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Firestar97

Firestar97
finglonger said:
itll be all disks - SSD, HDD, DVD\CD could affect the boot sequence but bootrec /scanOS will find the installed os on any disk regardless of its location, so long as the disk is enabled and recognised in bios

however if you onlly have one disk installed and running bootrec /scanOS finds no installed OS then your install is corrupt beyond repair
running
bootrec /fixmbr
bootrec /fixbootrec
followed by chkdsk /offlinescanandfix
might fix the problem but tbh you are likely looking at a reinstall
Click to expand...
Does this mean that I need to completely reinstall/reset everything again? Is there a Way to export my Files on a external SSD?
I love Windows 10 😒 before I've used this worthless Trash, I never had such extreme Problems.
Can I do something to make a Backup every Day so I won't need to torture myself for Hours?
It still shows the Option to close the System Repair Options and continue with Windows 10 Pro even though it couldn't find a installed OS
 

finglonger

F
Urufu1997 said:
Does this mean that I need to completely reinstall/reset everything again? Is there a Way to export my Files on a external SSD?
I love Windows 10 😒 before I've used this worthless Trash, I never had such extreme Problems.
Can I do something to make a Backup every Day so I won't need to torture myself for Hours?
It still shows the Option to close the System Repair Options and continue with Windows 10 Pro even though it couldn't find a installed OS
Click to expand...
you could use something like clonezilla or macrium reflect free to create whole disk system image - i usually only do this offline from the boot media just before any big updates.
iirc macrium has a paid version which you can schedule to run backups of either the whole OS or important files
fyi: a whole system backup can take an hour+ to complete depending on how large your install is - you may not want to be doing this every day



if your backing up your OS on a daily basis - you will need a spare disk at lest the same size as the disk your taking an image of

if you want to copy files to an external disk before you try and reinstall youll need to use the copy command for single files or try xcopy to copy entire folders and their contents

Xcopy command : syntax and examples

Xcopy command has advanced features than basic copy command and is useful for copying files and directories recursively. Xcopy has command line switches to exclude files, pick files based on updated date. Learn Xcopy syntax with examples.
www.windows-commandline.com www.windows-commandline.com
this is one of those things a linux distro on a bootable USB stick comes in handy for :)
 
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Firestar97

Firestar97
finglonger said:
you could use something like clonezilla or macrium reflect free to create whole disk system image - i usually only do this offline from the boot media just before any big updates.
iirc macrium has a paid version which you can schedule to run backups of either the whole OS or important files
fyi: a whole system backup can take an hour+ to complete depending on how large your install is - you may not want to be doing this every day



if your backing up your OS on a daily basis - you will need a spare disk at lest the same size as the disk your taking an image of

if you want to copy files to an external disk before you try and reinstall youll need to use the copy command for single files or try xcopy to copy entire folders and their contents

Xcopy command : syntax and examples

Xcopy command has advanced features than basic copy command and is useful for copying files and directories recursively. Xcopy has command line switches to exclude files, pick files based on updated date. Learn Xcopy syntax with examples.
www.windows-commandline.com www.windows-commandline.com
this is one of those things a linux distro on a bootable USB stick comes in handy for :)
Click to expand...
Thanks, I'll try it tomorrow. It's already late, I've wasted my whole Day with this frustrating Stuff and tomorrow's my first Day of Work, so I hope, I can at least relax a little bit
 
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