grub

[Bill McGonigle]

On Oct 10, 2007, at 20:34, mike miller wrote:

> I was dual booting winxp and fc6 until the motherboard died.  I  
> replaced it,
> using the same cpu, memory, hard drives and other peripherals.  I was
> pleasantly surprised to see the grub menu when I first booted but  
> the linux
> default boot failed.

Guessing: the old motherboard supported a LBA-disk addressing mode  
that's become passé and the new one doesn't.

> The
> update finished normally and requested a reboot.  On the reboot the  
> screen
> froze at GRUB.

I'm assuming there was a kernel update in there, so grub would have  
rewritten itself to disk.

I don't know what's going on, but there's some thing where when you  
boot off of a CD the OS inherits some BIOS parameters that might be  
different from when the kernel boots from disk.  I have a machine  
that will boot from DVD but the kernel can't access the drive if  
booted from disk.  I haven't been able to figure out what's actually  
going on there.

Once or twice I've been able to take a machine in a state like yours,  
boot from the Fedora rescue CD, chroot to the sysimage and run grub- 
install to get things working again.  Obviously, really understanding  
the problem would be better.

Just a check, there's not a hda->sda problem here, right?  Make sure / 
etc/fstab is accurate, and run mkinitrd if you need to fix it.

-Bill

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