How do a fix a non working kernel installation ?

[linux guy]

All traces of the f12 kernel have been removed without errors via rpm.
 My computer still won't boot.

When I run fdisk on sda (the hard disk), partition 1 is still set to
boot and the ID is still 83/Linux.  Everything looks good.

Why won't my computer boot ?

On 7/16/09, linux guy <linuxguy123 at gmail.com> wrote:
>> To fix Grub fast and easy, after editing the kernel grouping, or
>> anything else out of  /boot/grub/grub.conf, you can grab a livecd that
>> works good on fixing a broken grub boot, called super grub disk (I have
>> used it plenty of times when a borked boot of a fedora box happened to
>> me) and it works great.  Biggest thing I can think of is edit grub.conf,
>> and change the default to a known good kernel and remove the bad kernel
>> out. That is to say you have a good one you can boot off of still on the
>> system....
>
> I did that, twice, first off, before I ever posted to the group.   The
> f12 kernel installed to default 0 and then I had 2 f11 2.6.29 kernels
> in positions 1 and 2.  I changed the default to both of them and
> neither would boot.
>
> I think this is somehow an mbr problem.
>