try to recconect the cables and press the button on the PSU...
do you have 1 stick of ram? that might be the issue too... motherboards work in dual channel, so you need 2 sticks of whatever memory
Your statement about RAM is incorrect. You can run systems on 1 stick of RAM, you don't need 2.
@tbt3399. Does your PSU fan spin and supply power? Is your system making any sound like a beep?