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Old 12-17-2007, 06:06 AM   #1
Registered: Aug 2006
Posts: 37

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Multi boot problem

I set up a linux multi boot syetem with RHEL5 and Win2003.
It was working fine.

Now, I reinstalled win2003 (Keeping linux there).
Now only windows is coming up (Grub loader is not comming up)

I started the system with rescue CD...

What is next ????

Old 12-17-2007, 06:27 AM   #2
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Registered: Jan 2007
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ok, that is standart. A part of GRUB is writen on the MBR(Master Boot Record, you can check in wikipedia to see what that exacly is). When I installed windows. During the installation the MBR was rewriten. You need to rewrite it again so that it uses GRUB once again. Here is an example how to do that from a liveCD:

write "grub --no-floppy" in the console and then:

grub> root (hd0,0) (Specify where your /boot partition resides)
grub> setup (hd0) (Install GRUB in the MBR)
grub> quit (Exit the GRUB shell)
After the resboot it should be once again using the old grub settings.
I hope I have helped...
Old 12-17-2007, 06:31 AM   #3
LQ Guru
Registered: Nov 2003
Location: N. E. England
Distribution: Fedora, CentOS, Debian
Posts: 16,298

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You can do the following
  1. Boot from the rescue cd, first installation disc or dvd and enter
    linux rescue
  2. Enter details about your root (/) partition when prompted
  3. chroot to your Linux installation by doing
    chroot /mnt/sysimage
  4. Reinstall grub by doing
    grub-install /dev/hdX
    (substitute hdX with the drive where you want grub to be installed)

Last edited by reddazz; 12-17-2007 at 06:33 AM.
Old 12-17-2007, 06:40 AM   #4
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Registered: May 2007
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a very late response

when you start your computer, the first thing(after some selftests e.g. of memory) your computer does, is looking in the place called MBR, where he/she finds information about the operating system to start. Here Grub installs his information for dual-system start.
Windows doesn't aknowledge Grub or Linux or anything besides his/her own sort; and without much adoo overwrites the information in the MBR (so:Grub's configuration) with the new information how and where to start this new Windows-version.
This is why a dual-boot system is easiest accomplished when you first install Windows, whereafter, in Linux you make it dual-boot.
Old 12-17-2007, 07:20 AM   #5
Registered: Aug 2006
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thanks it worked for me
Old 12-17-2007, 07:49 AM   #6
Registered: Feb 2006
Location: Warsaw, Poland
Distribution: Archlinux, Debian
Posts: 139

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Originally Posted by crackerB View Post
thanks it worked for me
I am using multiboot for a long time (several years), so can say I have experience here :-) . Once I had 4 systems on my PC (now I have 3) including 3 systems loaded from primary partition (Linux does not require to be installed on Primary Partition, which is good thing).

My advise is to make a copy of MBR, so in case Windows will demage something (Bill Gates systems do not like any other system or your PC!) you can quickly restore it.

Every time you try to install Windows, it will demage your MBR.
it only 512 bytes

One possible solution is:
Once you have installed Windows, create a copy with Norton Ghost (as example). Next time you restore Windows from such image, it will not touch MBR.
I never install systems on my PC twice! Just once and then using images! I strongly advise this solution! You will save your time.



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