You may try to repair with the sabayon installer it self. VBoot with the DVD sabayon, installer etc... when the DVD locates installed Sabayon
first choose try to repair only the bootloader, and reboot.
if not, reboot with the DVD, again installer and choose repair broken system...
if the preceding tries fail, is it possible that you file synstem cam bem seriously damaged, in this case, is best to clena re-install it, since the system may be unstable even when possible recover it.
the 4.2 is newer, but the 5 version may be released in nearly a month
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE