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Old 03-30-2010, 09:26 AM   #1
sha587
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Multiple OS boot problem


I have window 7, Ubuntu and Cent Os installed in my system. I was actually trying to change boots options but unfortunatly i lost all boot entries. Is there anyway i can recover all three boot records.

thanks.
 
Old 03-30-2010, 09:49 AM   #2
ronlau9
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It is not clear to me what you mean by boot entries .
The menu.lst or grub ?
And with grub are you using UBUNTU or CENTOS ?
And with UBUNTU version are you using ?
 
Old 03-30-2010, 10:06 AM   #3
sha587
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I am sorry i should have explained it earlier.

Ubuntu Karmic Koala

CentOS 5.4

Currentlty i am using window 7 and i can't access other two OS. So my question is how can i access all three OS ?
 
Old 03-30-2010, 11:15 AM   #4
ronlau9
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You do not answer my question with grub are you using ?
And where did you install grub ?
On MBR of HD or on the boot partition of the distro ?
Because in the last case you have to use windows to boot linux
In windows XP it bis down in boot.ini .
I am not a windows user , I always use GRUB to do the job .
When you start you're computer do you even see GRUB on the monitor
 
Old 03-30-2010, 11:44 AM   #5
sha587
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No i dont see grub at all at startup. Currently i can only use window 7. I am new to linx so i dont know many technical details.

I have to use window to boot linux.

Is there anyway to do this?
 
Old 03-30-2010, 12:07 PM   #6
xxx_anuj_xxx
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use the rescue mode, as you've mentioned that you can access widows7 OS.
You can use Centos installation media in rescue mode and do a grub install after doing chroot /mnt/sysimage.

http://www.centos.org/docs/5/html/In...mode-boot.html
 
Old 03-30-2010, 01:33 PM   #7
_Linux_Learner
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Quote:
Originally Posted by sha587 View Post
No i dont see grub at all at startup. Currently i can only use window 7. I am new to linx so i dont know many technical details.

I have to use window to boot linux.

Is there anyway to do this?
This means that MBR is overwritten. Now boot in using live cd and use the following commands to re write the MBR...

Code:
sudo grub
This will start a grub prompt like grub>
Type the following commands....

Code:
find /boot/grub/stage1
If you are using a seperate boot partition use
Code:
find /grub/stage1
output of this is like...

hdx,y where x nd y are numbers

now type
Code:
root (hdx,y)
setup (hdx)
This will write the MBR back accordingly...

Hope this helps
 
Old 03-30-2010, 06:13 PM   #8
sha587
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I have ubuntu live cd and it is using grub2 and this method does not work. But i have fixed it by super grub disk. I appreciate your help.

thanks
 
  


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