RB912UAG-5HPnD stopped booting

My RB912 stopped booting. After power on all LEDS are ON except ETH, it’s displaying link activity. Reset button changes nothing at all. No beep sounds, while they were present during normal operation - 1 beep on beginning and 2 short when board is fully booted up. I had tried another patchcord, another power source - still the same. Is it just dead and should be recycled ?

There may be a relationship and here.

http://forum.mikrotik.com/t/attention-disaster-v-6-17/79234/1

My last upgrade was to ROS 6.15. There were a couple of power losses, but I had disconnected all devices after 1’st one. I had also remember that I tried to upgrade Routerboot from WinBox a couple days ago, but there ware reboots after that without problems.