Per John Smith:
any ideas why it should pull up the Gigabyte screen twice?

Mine gets into these loops where it just keeps popping the splash
screen and re-booting forever.

I get it to start up for real by pushing Reset at the right time
just after the beep.

Somebody commented that this is a firmware or driver problem that
can be fixed by downloading/installing the latest-and-greatest;
but I haven't gotten around to it yet.
--
PeteCresswell