It no longer POSTs and I get Q Code 55, which indicates there is no memory installed.
It is listed as "memory not installed", but it's actually an initialization error.
Perhaps try to reseat the CPU as suggested. It sucks, but it's about the #1 cause of no post with LGA socketed chips. (welcome AMD to the club coming soon). This sometimes happens right away and over time. The cooler mounted to the board flexes the PCB. Causing pins to no longer make adequate contact.
If you've reseated the cpu, then I would say to swap to a different processor to determine if the board has an issue or not.