I have a Macbook Pro with Retina Display and I've downloaded ML and created a bootable USB key following every instruction very carefully. I booted from the USB and went into disk utility and wiped the rMBP SSD. I then reboot from the USB and it starts to install but then I get kicked out with a message: "There was a problem installing 'Mac OS X.' Try reinstalling" When I go into disk utility, I do see something on the left beneath the hard drive and USB drives under the black line called "disk 2" with a partition "Mac OS X Base System." Is this what's causing the problem? Right now I have a blank hard drive and when I boot without the USB key, it just flashes the folder with the question mark. Please help! I did make an appointment at the Genius Bar tomorrow in case I can't resolve this.