Hello good people. Issue is as it says in the topic. I am at my wits end on this one, so any help that you can shoot my way will be met with eternal gratitude!
The bios chip has 4.60 printed on it and the box has a neat little 'Ryzen 2000 series ready' sticker on it.
The CPU heatsink fan spins up, the power LED turns on, the HDD is spinning and there is power to the USB ports.
I have built the system with the parts below:
FSP Raider II Edition 550W 80PLUS Silver Power Supply
ASRock AB350 Pro4 AM4 ATX Desktop Motherboard
Kingston 8GB Kit (2x4GB) DDR4 HyperX Fury Black C15 2666MHz (placed in A2 / B2 positions)
Kingston SSDNow UV400 240GB 2.5" SSD
AMD Ryzen 5 2400G 3.6Ghz 6MB AM4 APU Retail Box - With Fan
Things I have tried:
RAM - Removing / replacing / placing into different configurations.
CPU - taking off the heat sink and checking it is seated happily (it is).
Power - ensuring that the 8 pin and 20+4 pin connectors are connected (they are).
Monitor - checking that it is working on another machine (it is). Trying a different monitor (also doesn't work).
Drinking coffee / meditating - still frustrated.
Thanks for any and all help!