Hello all, This seems to be the best answer. It seems that my MDD lost the startup drive setting because it couldn't simultaneously power a pair of external Firewire drives. Per TS1892, I held down the X key while rebooting, then reselected the startup drive. Thanks to all, Bruce On Feb 19, 2010, at 11:38 AM, John Baltutis wrote: > On 2/19/10, Bruce Ryan Nakamura <galilao at lava.net> wrote: >> >> Instead of a ? mark, one of my G4 MDDs is showing an empty set symbol >> on the screen upon start-up and won't fully boot. What does the empty >> set symbol mean? > > It's the prohibitory sign. Amply explained in > <http://support.apple.com/kb/TS1892>. > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4