moving hard drive to new machine

[P. George]

i posted this earlier to the "install" mailing list, but i don't think 
too many folks are on that list.  very quiet.  spooky quiet.

so, i'm gonna have to re-post on this list, and i apologize for having 
to x-post in the first place.

okay....

the problem is that i had this old clunker that i ran redhat on.  i 
spent a really, really long time getting it set up just exactly the way 
i wanted it.

i just moved, and during the move, the motherboard got bumped into by 
something and some little soldered parts were knocked off.  long story 
short... dead motherboard.  no biggie.  i've got another equally lame 
motherboard to use in its place.  this one is amd-based though; the 
other was intel-based.  everything else about this setup is the same.  
same video, same ram, same power supply, same everything.  when i boot 
it up now though, i get to grub and double-click on my install and, 
instead of proceeding to boot, the grub screen vanishes and the 
computer reboots.

what can i do to salvage this installation?

thanks.

- philip