New build, finally moved from Intel, might be regretting it now...
3900X in a X570 ROG STRIX MB, Corsair RAM, NVIDEO 1660 Ti GPU.
Worked fine for a week, then sudden black out.
Powered up again, worked for a few mins, black out
Powered up again, nothing.. MB has DRAM, CPU, VGA, Boot lights.
Get's stuck on VGA Light
However as the 3900X has not onboard GPU, can't tell if this is the true source.
Asus suggested to remove everything bar one stick of RAM, same problem. Tried new RAM, same problem
RMA MB, same problem
changed all power cables, changed GPU, took out GPU, same problem.
I do know that when I remove all the RAM, I get a DRAM error on the MB, so it's doing something.
CMOS reset, nothing changed
Flash updating BIOS gives 3 flashes that last 5 seconds, and then solid light.
As this is the expected behaviour for BOTH successful BIOS update, and malfunctioning update, that's useful.
However the light never goes out, so I think it's the latter.
All I can think is that the CPU died one week in to it's life. Is that likely? What else can I try?