firstly, have you set up the proper drive to boot on your BIOS (the one you've installed sabayon and grub)?
after that, grub should appear on your screen for you to select the OS to boot.
you will probably have problems when trying to boot windows, since that's a dumb OS that only boots if it thinks that it's the first drive.
solution? remap the drive on grub.conf file.
example below (you will probably have to change some stuff on your file, so don't just copy it):
- Code: Select all
map (hd0,0) (hd0,1)
map (hd0,1) (hd0,0)
anyone correct me if i'm wrong, but I think it solves your problem