Hmm nice to see I am not the only one with this DRAM LED problem, I guess we need to wait for someone at OCHQ to reply, I currently have replied to an RMANote where they asked me to check if the CPU pins were damaged, reseated the CPU 3 times now too.
Everything points to a bad motherboard or CPU, no way 3 different graphics card, 5 sticks of ram and 2 PSU's have all gone bad at the same time.