Symptom
You hear the PowerBook wake up, but it has no video.
Solution
When started up from Mac OS 9.x, PowerBook users can switch between an external monitor and the built-in display by putting the computer to sleep, connecting or disconnecting the display cable (VGA), and waking the computer up.
If you attempt the same in Mac OS X 10.0, the computer wakes up without video. When this happens, you can shut your computer down normally without video by following these steps:
1. Press the Power button.
2. Wait a few seconds.
3. Press the Return key.
4. Wait a few seconds.
You should hear the computer shut down. If it does not, you may force it to shut down by pressing and holding the Power button until the computer shuts down. This may take up to 10 seconds.
Note: Pressing and holding the Power button does not shut down a PowerBook G3 Series (Bronze Keyboard) computer. You may use the Control-Command (Apple)-Power key combination to force a restart.
After the PowerBook is shut down, connect or disconnect the monitors as desired and restart.