Minimum daughter boards/peripherals required for main board to boot

[cmicallef]

The keyboard is a USB device, I'm pretty sure it's not necessary.

You could answer your own question by plugging everything in and without the battery, using the bypass, see if you have the same results as now.

@KC9UDX With only the keyboard plugged in, the power LED turns on, orange for about 2 seconds. But it seems that the main board still doesn't boot. I say this because the CPU remains cold.

Plugging everything in as suggested results in no further changes.

I observed all of this before posting.

I don't think my board and its components are a good use case to determine what the minimum required for the main board to boot. If there is a possibility that my main board (or other components) are faulty then I won't get very far. Only someone with a good working system can confirm what is required (which is probably not me).