RooooooooooB

Hi there I am currently building a PC for mid to high end gaming when i boot up the machine i get led's and fan all running, no bios beeps, but no display output. I am running: Motherboard - Asus M5A78L-M/USB3 CPU - AMD FX 6350 Ram - 8GB (2x4GB) DDR3 1600mhz Graphics Card - Sapphire Dual-X R9 270X 2 x optical drives 2 x 2.5 inch hard drives i am trying to run it off of a CoolerMaster B600 600w PSU 85% efficiency Am i being an idiot? is this to little power? I had a ram issue but i replaced them