My Apple mac won't re-start in OS9

Question

Apple macintosh: my G4 dual processor Mac runs OSX and OS 9. When running OSx I tried to switch to OS9 by the usual method; i went to mac preferences and selected OS9 and asked it to restart. It closed and seemed about to restart, but instead I get a flashing button in the middle of the screen with a picture of the earth on it. I tried closing and restarting but the sme thing happens again. Help!