Kernel Panic is making me panic

[Arthur Dent]

Hello all,

On Feb 29 my Fedora 16 box updated itself (I'm not wild about the only
options being completely manual update or completely automatic update -
but that's another story). It must have updated the Kernel because the
next day when I turned on the PC I had a kernel panic (details below)
and the machine failed to boot.

I had a zero timeout on grub so this meant that I had to use a Mint
liveCD to edit grub so that I could try booting with the previous
kernel.

The fact that I am able to write this shows that the previous kernel on
the very same machine boots without problem. This is the "previous"
working kernel:
$ uname -a
Linux localhost.localdomain 3.2.6-3.fc16.i686.PAE #1 SMP Mon Feb 13 20:44:23 UTC 2012 i686 i686 i386 GNU/Linux 

The kernel that is failing is 3.2.7-1.fc16.i686.PAE

Below I have tried to type as accurately as possible the kernel panic
message that I get when I try to boot into the new kernel (note It's
typed manually - NOT copied and pasted - so i might have made the odd
typo).

What should I do?

I can think of no obvious hardware problem given the fact this the
machine boots happily with the previous kernel...

Thanks in advance...

Mark

==========8<=======================================================
   Booting 'Fedora (3.2.7-1.fc16.i686 PAE)'

Loading Fedora (3.2.7-1.fc16.i686 PAE)
Loading initial ramdisk ...
[   2.957551] Kernel panic - not syncing: VFS: Unable to mount root fs
on unknown-block (0,0)
[   2.957599] Pid: 1, comm: swapper/o Not tainted 3.2.7-1.fc16.i686.PAE #1
[   2.957639] Call Trace:
[   2.957682] [<c0933468>] ? printk +0x2d/0x2f
    ... another 8 lines similar to this ...
[   2.957599] [<c0943efe>] kernel_thread_helper +0x6/0x10
==========8<=======================================================
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