i recently i update the os from 9.0 to 9.1 and i added the tcp/ip to connect to the internet and suddenly after i reboot it the screen went to a freeze from a picture of Mac OS 9.1 and there's only 3 icon at the bottom showing only instead of the whole line of icons ( showing the 2 arrow parrarel,the question mark and the sound) i don't know how to go to safe mode or anything on the keyboard which alter the start-up. pls. help