Your isolations are pointing out to 3, RAM CPU and MOBO, and I'm afraid what I will suggest is to try the spare ones you have. but I did assembling my rigs without anti static wrist and luckily don't have any problem with it, I've read somewhere that its safe by just touching the bare metal of the case before doing assembles.
Thx! I got a bit further. Made my own chassis speaker from an old motherboard and attached it to the ASRock.
When I power on I hear 3 long beeps, then a pause, then 3 long beeps, etc.
Could it be the RAM?