Well this is weird. I just went in to check that and now the PC isn’t booting up at all. It worked fine after installing the AMD drivers yesterday so not sure what has changed.
Before, it was running the memory test for a while with fans going before I see the ROG logo on screen. Then a beep. Then it would boot up quickly.
This time I forgot to turn the monitor on, went out the room and when came back fans are still going full. Turning monitor on has nothing. I held power button to shut down, tried again (with monitor on) and now it’s not even getting to the post beep!! 
Any ideas what I can do?
Keyboard lights are not coming on when first powered up - maybe it is not seeing the KB?
EDIT: tried the shut down and start again and got this after long time and a different short beep:
Now KB lights are on. ?!?
Also why it says DDR5-3600?