AsRock Z170 Etreme 4 shows 00 error code

In decades I've found 98% or more motherboard failures over CPU failures. That is unless the owner tells me they overvolted the CPU then the nod is to the CPU.

-> In parting all those parts are not required for testing. All I need is some cardboard, motherboard, CPU+HSF, one stick ram and PSU. No case or what else is on that list. I can imagine some techs still don't know this sort of testing.

The manual talks about resetting the cmos......that's free.

Then you replace the cmos battery......that's a few bucks and easy to do.

Then you move into make it smaller.

On cardboard.....psu + mobo + cpu/hsf.

If that does not power up your down to 3 parts.