CentOS - Sep 2007 - CentOS 4.5 system doesn't boot after installing latest updates

Today I decided to install all the latest updates (including the -06  
kernel).  The "yum update" seems to have run just fine (no errors),  
but when I rebooted the system it just sits there with the word  
"GRUB" in the upper left hand corner.  I booted from the CentOS 4.5  
install CD into rescue mode, did a "chroot /mnt/sysimage" and  
reinstalled grub and the latest kernel, but it still gets stuck in  
the same place.  It's not that I can't boot the new kernel; I can't
even get to the grub screen!

Any ideas?  I am totally stuck at the moment...

Alfred

> Today I decided to install all the latest updates (including the  
> -06 kernel).  The "yum update" seems to have run just fine (no  
> errors), but when I rebooted the system it just sits there with the  
> word "GRUB" in the upper left hand corner.  I booted from the  
> CentOS 4.5 install CD into rescue mode, did a "chroot /mnt/ 
> sysimage" and reinstalled grub and the latest kernel, but it still  
> gets stuck in the same place.  It's not that I can't boot the new  
> kernel; I can't even get to the grub screen!
I'll answer my own question.  In addition to re-installing grub, a  
"grub-install /dev/sda" was required to get the system to boot.  I  
thought that reinstalling grub via yum/rpm would take care of it, but  
apparently it didn't.  Lesson learned, panic averted.

Alfred