check 24 pin power to board is full6y inserted

check 8 pin cpu/eps power lead to board IS ACTUALLY THE cpu/eps cable from psu and not a pcie graphics (yes it happens a lot)

finally pull the ram stick out and then reinsert it  (it takes much more pessure than you think it does to seat fully and hear a clear click with either end tab locking it in place)

disconnect the hard drives/ssds and test for boot

finally if still no joy check the sticker on the bios chip (middle of board) it should read version 4.xx or higher

as your cpu 2700 requires an updated bios to be used in a x370 board

if the sticker reads 1.6 > 3.30 or anything inbetween it wont boot with any ryzen 2xxx cpu

I made a new build for rendering and editing and it is as follows:

ASRock X370 Pro4

Ryzen 7 2700 with EVGA CLC120 liquid cooler

Corsair Vengeance RAM [1x16gb]

Asus gtx 1050ti 4GB

600W PSU

Sandisk 480GB SSD

Random 500 GB HDD I had lying around

The problem that I'm having is that there is no output signal to the monitor. I made sure the RAM is plugged into the correct [A2] slot, the monitor is plugged into the GPU, not the MoBo. I've checked all the basics but it doesn't seem to be any of those problems. 

The PC fires right up, all LED's and fans going, but no signal to the monitor. Ack!

Am I missing something stupid/random?

Any and all advice/help is much appreciated!!

 

Thanks!