Motherboard won't boot to bios.

It should work assuming that it has the correct bios (which it should given that the APU was released before the 3600 was).

have you booted teh motherboard with the minimal amount of stuff attached to it before building the computer? (a pc can be booted by only having the cpu(and its heatsink), 1 stick of ram and the motherboard, power supply and a metal object(to bridge the power connector) outside of the case

 

hmm, does it stay on, or does it turn on and then off.

Just to be sure of the checklist that youve completed


you have plugged the following into the motherboard:

CPU(with the gold arrow corner in the correct corner orientation for the socket) and the heatsink ontop of it
power supply 24 pin on the right of the motherboard(general board power), as well as the 8 pin that goes on the top left of the motherboard(cpu specific power)
one stick of ram(for testing purposes)
whatever display cable plugged into the motherboard

 

https://forums.tomshardware.com/threads/ryzen-3-3200g-support-on-gigabyte-a320m-s2h-rev-1-1.3565439/

According to this thread you needs to look at the manufacture date, believe you need F40 Bios for that CPU.

 

It shouldnt be a problem because newer revisions of the board have Ryzen 3000 ready slapped on them with a sticker out of the factory to let buyers know that its flashed. Note that the person in that tomshardware bought it when only ryzen 2000 ready was in the market


OT: have you tried the other stick of ram, in the other slot as well?

 

Your monitors can't display 640x480 (or is it 320? I forget) is my guess. a cheap old vga lcd should work good for getting setup. I've got old LCD monitors for this very specific problem.