Monitor doesn’t get a signal

Hello,

So I built my computer recently and I’m pretty sure I put everything in correctly how ever when I boot it I turns on perfectly fine and the fans spin gpu and psu fans spin and my power button works but it just doesn’t get signal for some reason.. I tried using hdmi from gpu to my display and that got no signal and I tried removing the gpu and using vga from my motherboard and still I got 0 signal. I tried cleaning my ram but I was wondering if the b350 tomahawk mother board supports 3000mhz ram because I have no idea if that matters, because when I built it on pcpartpicker it said all my parts were compatible so that’s where I’m confused. I feel like I may have messed up a pcie cable or something in my mother board. Also I have nothing in my ssd not even windows and now I have no idea what could be causing this error PLEASE HELP!!!