I recently tried to turn on Internet Sharing for my mac mini, and accidentally hit 'Remote Management' which turns off screen sharing! I have no peripherals - not even a display, but I do have a lot of Apple Laptops. Is there any way to turn it back on if I know the root/admin username and password?!
I also tried booting in target disk mode - both machines are running mountain lion, and connected through a firewire cord (with a thunderbolt adapter on one side). When I boot my machine in target disk mode I just get the firewire logo bouncing around, never see the others image.