I have the new MB pro (first time mac buyer). When I plug in my 500GB lacie HD via firewire 800, the mac will NOT boot up to OSX on the mac HD. Instead I get the flashing folder with a question mark. When I unplug the external HD the mac boots up just fine to OSX on the mac HD. Once my mac is booted up, I am able to plug in the external HD and it is recognized and I can use the HD like normal. My HD is formatted for Mac. How can I get it so if my external HD is plugged in it will boot up (without a flashing folder) to the OSX on my mac HD?????? Thanks.