Since starting with the Raspberry Pi, I chose to order a pre-installed SD card with NOOBS to start easily on multiple OS. Unfortunately when I started the first time, the LED was blinking green, then nothing, and no display on the screen. I made sure to save the contents of the SD card before reinstalling an image of RaspBMC (for multimedia) recovered on the official website, and everything worked properly. I might as well have ordered a blank card and do this manipulation.