Ubuntu won't display if boot not viewed

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http://askubuntu.com – I am using Ubuntu Linux 11.10. Currently, I have Windows XP on one computer, and Ubuntu on another. I switch between the with a VGA box that allows me to switch which computer is connected to my monitor. For some reason, if I am viewing Windows XP while Ubuntu is booting, the screen will be black when I switch back over to it. I have waited 15 minutes on this screen, and nothing happened. I have also tried to "wake it up" by moving the mouse and using the keyboard. Ubuntu boots fine if it is connected to the monitor when it boots. Does anyone know what could be causing this? The output of lsp (HowTos)