How do I stop the Booter once it has started?
You can press Command-. (period) if you are fast enough. Once the screen has changed color, there is no going back. After that point, the only way to stop the boot is to hit the Restart button (or Control-Command-Power if your machine supports it). This is also true if the Booter should hang during boot. If you do halt the boot, it is usually a good idea to quit the Booter and restart it. Otherwise it might hang if you try to boot again.
