Help problem starting the computer for first time!

Help booting for first time
Hi it is the first time i build pc
When i power up the computer the motherboard light up and the mem ok led is flashing but nothing else works when i press the start button nothing happens

I connected the dvi cable correctly and the 6 and 24 pin connector from the power supply correctly

my specs are:
asus maximus v formula
intel i7 2770k(arctic silver 5)
corsair h80
gtx 660ti
corsair vengeance 2x8gb
corsair hx 1050

thanks for reading