Boot failure after update

[Chris Birchenhall]

Hi guys. I have successfully loaded Core 3 onto two machines. All went very 
smoothly until I updated on my Sony desktop. After the first update (kernel 
and kernel-utils) the system hung during boot up. Fearful I had done 
something silly I did a clean rebuild. Again went smoothly until I updated; 
same problem, system  hung during boot up. Any clues why I am having this 
problem? Chris