Thanks for replying Tony. The waterfall happens directly and almost immediately after the GRUB boot command. Within a minute or two, it freezes to a static multi-colored screen of gibberish.
I have seen reference to 'quiet' and rhgb' but where would those go/where would I remove them? They are not on the command line args in GRUB as viewed by typing 'e'.
Try adding "nofb" to the grub command line args and see if that helps.
Paul.