Asus B450M/A CSM, 2600X and 2x16GB ECC no post after 2 months

[dbx10]

The CPU has been posting L1 cache errors in the TrueNAS logs at the same memory address for 2 days, it had trouble posting in the past, but a power cycle usually got it through. This morning, after an unscheduled restart from the server, I power cycled it from S5 to access the BIOS and update it, and it never bame back alive.

The board presents a beep code for no ram when no ram is installed, but doesn't make it past post. I have tried with spare corsair non-ecc memory sticks in all correct configurations, nothing makes it post.

I'll try tomorrow with a 3600X I have laying around, but in your opinion is the motherboard dead or the CPU? 

[dbx10]

After testing: both dead