HELP!! Birthday present went wrong :(

Hello,

My name is jack, and I've been building a computer for my birthday funded by my mum. SO, I picked up the AMD FX 8350 CPU, 600W CX Corsair Power Suply, 970 Pro Gaming/Aura MOTHERBOARD, EVGA GTX 960 graphics card and a 1tb harddrive and H75 corsair Liquid Cooler. As I was building my computer it went very smoothly, everything was in place and it was going perfect, until I turned the computer on and nothing booted up, no bios no nothing just black my monitor didn't even turn on ( monitor is in perfect condition). I tried inserting the motherboard disk and the graphics card disk and no hope. I later on that week took it to a computer store to ask them if they could try fix it or at least tell me what the problem is. They came back to me and told me it was a dead motherboard so I went and got a replacement ( the same type of motherboard) and just a few minutes ago put everything together again and it was looking good , again until i turned it on. The same thing happened no bios no screen no display whatsoever. I did take the cmos battery out and in again, tried the 1 ram stick then 2 ram sticks then no ram sticks and listened for beeps but I heard nothing. I am completely baffled and upset! It's really disapointing please help!!!