I’m not sure why Dell can’t actually tell people this.  However, if you find yourself stuck booting Dell MediaDirect, and don’t know how to fix it.  Try this:

  1. Turn off your computer
  2. Hit the button shaped like a home (the Dell MediaDirect button).

Seriously.  When the power is off, the Dell MediaDirect button acts a toggle button to boot the other partition.  Try to find that on Dell’s site, and well, I couldn’t find it with several good searches.Thanks to GigaMegaBlog.