AB350-Gaming 3 MoBo CPU light

[rhubarb]

Two month old build with AB350-Gaming 3 with Ryzen 5. It's been working fine but recently and intermittently when I power it on the CPU light comes on. No monitor, no keyboard/mouse.

If I force a power down by holding down the button it will restart and I can get into my OS.

How do I troubleshoot this?

Thank you.

[shadowsports]

As a matter of course, I would confirm the health and function of your PSU.

I would also reseat my CPU and memory.  If the behavior continues, I'd consider upgrading the BIOS to a later version.  Keep in mind however, that this platform has been inconsistently reliable.  See the various posts from others here.