Here are some links to steps to take to solve this sort of problem, courtesy of Apple's Knowledgebase: <http://docs.info.apple.com/article.html?artnum=106805> <http://docs.info.apple.com/article.html?artnum=106464> "Leo D. Venezuela" <levenezu at myrealbox.com> writes: > I wanted to make the FireWire drive into an OS X startup disk. I > installed OS X 10.2 on the FireWire drive and upgraded the > installation to 10.2.6. I then selected the FireWire drive as the > startup disk in the Startup Disk option in System Preferences. My > TiBook then restarted. However, after the startup gray apple > disappeared, it was replaced with a gray "forbidden" sign and the > startup process wouldn't continue further. I also tried to boot from > the FireWire drive by pressing the Alt/Option key during the startup > process and selecting the FireWire drive. But after selecting it, I > also get the "forbidden" sign and the process wouldn't proceed > further. I've already installed the PowerBook Firmware Update 4.1.8 > but the problem persists. Kynan Shook kshook at mac.com http://homepage.mac.com/kshook/index.html