G3 AIO running 10.2.6 used in my classroom. I was logged in on my admin account with system preferences open. I had to leave the computer for a minute and in that time one of my students set the startup disk to "network" and restarted. Naturally there is no network to startup from. The machine just sits there with a grey screen for hours now. It never gets bored of looking for a network and loads off the hard drive. I can't boot from a CD either. It seems like I have to reset something on the board but I don't know what. Ideas?