Troubleshooting boot problem

[Dan Buehler]

I am trying to troubleshoot an intermittent boot problem. First, I set
the defaults to allow me to see all the boot messages.  When it failed
again I was able to determine that the problem occurred right after the
grub menu selections go away but before the OS is loaded.  It just
stopped there with nothing but a flashing cursor.  

Does anyone on the list have a suggestion how to troubleshoot this kind
of problem?  Is there a way find out what problem grub encountered?  I
am pretty much a newbie here and will appreciate any help.

I am using ubuntu 10.04 with grub2.

Dan