[NTLUG:Discuss] CentOS 4.4 wont boot - how do I restore boot sequence?

[John K. Taber]

I don't know anything about CentOS, but maybe your problem is similar to
what I had. It sounds like your machine cannot find the MBR.

Try reinstalling grub from a Linux rescue command line, if you have a
bootable CD or diskette. You might have to change the boot sequence in
BIOS first.

On the rescue command line, enter "grub". If that gives you the grub
command line, then try to find the boot partition by entering the grub
command:

root (hd0,1)
or
root (hd0,2)
or ... experiment

grub will report when it recognizes a partition, hopefully the one with
the MBR. Otherwise, grub reports "Unknown partition type" or some such
message. Note that grub knows nothing about sdn's, only hdn's regardless
of type of hard drive.

Then install grub again:

install (hd0)

Finally, quit grub with "quit", and exit the rescue command line with
"exit", and restart your machine.

On Thu, 2007-05-03 at 13:40 -0500, Neil Aggarwal wrote:
> Robert:
> 
> It does not get to grub.
> 
> The machine gets to the bios checking for a bootable CD
> and then stops.
> 
> I checked the bios and the drives are there.  They are SATA
> drives.  I can see the data when I boot the LiveCD and mount
> /dev/md0, /dev/md1, and /dev/md3
> 
> Any ideas?
> 
> Thanks,
> 	Neil 
> 
> --
> Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com
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> 
> -----Original Message-----
> From: discuss-bounces at ntlug.org [mailto:discuss-bounces at ntlug.org] On Behalf
> Of Robert Citek
> Sent: Thursday, May 03, 2007 12:39 PM
> To: NTLUG Discussion List
> Subject: Re: [NTLUG:Discuss] CentOS 4.4 wont boot - how do I restore boot
> sequence?
> 
> Neil Aggarwal wrote:
> > I have a CentOS 4.4 system that wont boot after the 
> > storms from last night since they knocked out the power.
> 
> When grub shows up at boot, add '-b 1' to the kernel line.  How far do
> you get in the boot process?
> 
> Regards,
> - Robert
> 
> 
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