Which "g3" notebook are we talking about here? The "Kanga" shipped with Mac OS 7.6, and should have no complaints under OS 8.1. "Wallstreet" (series I & II) were next, and shipped with OS 8 and OS 8.1, respectively. Neither of those should complain about OS 8.1 either. If it's a "Lombard" or later, then I'd be curious to know how OS 8.1 came to be on it since the Lombard shipped with OS 8.6 (and very likely will NOT run well on an earlier OS).