bootmgr is missing

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Captain Sisko
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bootmgr is missing

Postby Captain Sisko » Wed Aug 27, 2014 7:31 pm

I have been dual booting Windows 7 on my old acer laptop I did have 64 bit windows 7 installed but then got another HD and installed windows 7 32 bit on that

The 32 bit is the better one to use as the 64 bit lags a little on my aging acer
The 64 Bit one was installed first

I want to remove the win 64 bit HD for testing laptop restore CDs for a new laptop. But as soon as it's removed my Acer gives the bootmgr is missing messsage
Any ideas on how to get the blasted thing going?

I have used a windows CD image (on usb stick) to repair startup problems but that hasnt worked
If I stick the second HD in the system boots - I then changed the default OS to Windows 7 and removed the time option but as soon as the second HD is out it cant find the bootmgr.

The answers prob staring me in the face
Do I ned to copy the bootmgr/boot.ini from the second HD?

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DCUK7
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Re: bootmgr is missing

Postby DCUK7 » Wed Aug 27, 2014 8:38 pm

You're getting that error most likely because your boot config is on the drive you removed. You need to rebuild it on the drive that is still installed.

Use your USB Windows image to boot into the system recovery environment and in there you should be able to open a command prompt. At the command prompt type bootrec /rebuildbcd and that should search your hard drive for valid Windows installs and rebuild the boot config (BCD).

Captain Sisko
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Re: bootmgr is missing

Postby Captain Sisko » Thu Aug 28, 2014 11:47 am

Thanks DC

I'll try that

I have noticed one other issue
The recovery tool doesnt see the remaining HD
Even odder even with the other HD plugged in the windows installs don't appear

It is selected as the boot device in the BIOS
When I boot from the Pendrive the installer see's that there is a c:\windows folder but the startup repair tool doesnt work
I get a "failed to save startup options"

If I do the Scan OS it detects the c:\windows install
If I then the rebuild bcd and add the installation to the boot list it says "the requested system device cannot be found"

The command prompt shows x:\ but I think thats something to do with elevated privedges right?

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Re: bootmgr is missing

Postby Captain Sisko » Thu Aug 28, 2014 9:17 pm

Fixed

I went into my cupboard, dug out the Win 7 discs and repaired the boot sector using that.
Bit miffed the USB didn't do the same job!!

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DCUK7
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Re: bootmgr is missing

Postby DCUK7 » Thu Aug 28, 2014 9:20 pm

The X:\ is just the drive letter assigned to the RAM storage. When you boot into Windows PE, it loads the OS into memory and gives it the X drive letter.

I've seen this error happen when booting the PE environment from a USB3 port, or a port that for some reason Windows PE doesn't like. Try using another USB port or if possible, a bootable DVD of the Windows disc.

If that doesn't work, try running the bcdedit /enum all command. That should list the OS and the bootmgr (if it exists). If you see your Windows install, run bootrec /fixmbr and then bootrec /fixboot. If they complete ok, then run bootrec /rebuildbcd.

If the above fails then it could be that you are lacking either the 100mb boot partition on the main disk or have another boot issue. For that I'd run this command bcdboot.exe C:\Windows C:.

Definitely try the alternate USB port then DVD disc first though. You'd be amazed how often the recovery environment fails to fix problems when it boots from USB!

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DCUK7
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Re: bootmgr is missing

Postby DCUK7 » Thu Aug 28, 2014 9:21 pm

Thought it would be!

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Re: bootmgr is missing

Postby Captain Sisko » Fri Aug 29, 2014 8:17 am

Thanks DCUK

Its a little puzzling as I tried diff USB ports
Then for testing I tried on my desktop and it messed the boot on that.

Thats when I dug out the discs fixed my desktop then the laptop.

I wonder why did the DVD work and USB didnt?
Its a Kingston USB 8GB stick and I was using the windows 7 usb/dvd download tool.

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DCUK7
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Re: bootmgr is missing

Postby DCUK7 » Fri Aug 29, 2014 9:19 pm

The recovery environment is very picky when it comes to the drive its on and the filesystem in use (and even the way the sectors are formatted). I always keep Windows discs around for that very reason.

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Re: bootmgr is missing

Postby Captain Sisko » Sat Aug 30, 2014 5:23 pm

It is picky!

I installed Windows on a test HD using the USB

It worked fine using the test HD in my Acer

I tried booting from USB on a new Toshiba laptop and it didnt boot from USB

imtahan
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Re: bootmgr is missing

Postby imtahan » Sun Apr 17, 2016 8:34 pm



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