B LED blinks only

Hello, I have some strange problem with my Turris Omnia. After power on only B LED blinks once per second and nothing else happens. I have tried to hold reset button but it does not do anything. I was not doing any reconfiguration or anything like that before power down, it just happened without specific reason.

Have you tried it with different PSU?

Well, actually, I have just opened the box, measured power supply voltage that was as expected, then I disconnected both HDDs I have in the box and after that it suddenly started to work after while. Then I reconnected HDDs and it is still working. Voltage under load is still around 11.9V that should be fine IMO. So it resolved itself somehow but I do not like such solution, because I do not know what the problem was :confused: