Hi all: Last night, my computer was working great. This morning, I go to boot it up and it starts up fine, but then the screen goes dark about a minute or so into the process. I can't tell if it's continuing the booting up process or not. I have tried re-starting it and the same thing happens repeatedly. I also tried booting it up with the OS X disk, but then the computer wants to install OSX. Any thoughts? I'm leaving the country in a few days and desperately need help! Thanks