Question PC won't boot (I think)

Feb 28, 2020
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Hello.

So i recently decided to get a new pc and build it myself since it was cheaper. I have never built one before but I had a friend help me out and we are 99,99% sure everything is placed and plugged right. But when i plugged the pc in it can't read any of my monitors. They just can't get a signal from the pc. Both my mouse and keyboard lights up normally when when i plug them into anything else. So i though there wasn't going any power through the USB ports as well. But I tried to see if i could charge my phone through them, and it started charging with no problem. So I think there might be a problem with the pc booting. If anyone has any advice that might help me I'd greatly appreciate it.

The pc build is:
Graphicscard: GeForce GTX 1060 6GB
Motherboard: ROG STRIX B450-I Gaming
CPU: AMD Ryzen 72700x
Power supply: Crossair CXM 550W
RAM: DDR4 (2 x 8GB)