Very similar thread below, however I am having a different problem.
I bought A Ryzen 5 1600, AB350M Gaming 3 and Corsair Vengeance LPX 3000mhz ram.
I have tried to build the above and when I power on the fans spin on the CPU + GPU, a red LED strip on the board appears down by the bottom left, but I get no bios beep and no display output. I have tried my current GPU, an older GPU, on board outputs, DVI, HDMI and one stick of RAM in each of the four slots.
Any more ideas please?