I have brought a new raspberry pi 3 with case, power supply and SD card with NOOBs already installed.
I connected as shown on raspberrypi.org and only got one green flash. When i checked the data on the sd card i noticed that "bcm2710-rpi-3-b.dtb wasnt on the sd card but is on the newest version download of NOOBS.
I have reformatted this SD card and copied NOOBS from the extracted zip folder as shown on the sticky thread. Still only get the one green flash then nothing. I have tried two more sandisk SD cards i had and still the same thing.