yum update 2179 kernel

[John Fleming]

I ran "yum update", and it updated OpenOffice and got kernel 2179 (currently
running 2174).  However, there was a message about a bootloader not being
found.  Now, of course, the 2179 kernel is not in the list of choices in the
graphical bootup screen, and it defaults to 2174.

This is not a dual boot machine.  The bootloader is GRUB.

I've updated with yum about 10 times now, never before with this problem.
Everything else about the machine is working fine.

1.  Why did it happen?

2.  More importantly, how do I fix things?  I just tried looking at
/etc/grub.conf, but vim treats it as a new file...???

Help!?  Thanks - John