I have had two similar problems hardware in a very short period of time .
On one hand I missed a U- 5HnD OmniTIK . And now 5HPnD Mikrotik Routerboard SXT .
In both cases I do not get the ethernet port online .
In case of SXT at the beginning of the boot process , and before the startup beep , beep strangers are very short - almost like noise , and after a while (between 5 and 10 seconds) if that sound seems to ring twice announcing the OS load , but the ethernet port is "not connected" . I tried with several laptops and also with a switch.
My question is whether the process of switch equipment could damage the systems .
I must say the equipment is supplied with the charger that came with the kit and that in both cases extropeo in the laboratory before being installed on the outside , and after configure , and test has to make a shutdown , turn them off , removing the food- and reconnected .
One of the times the SXT if you let me do the reset , but then after the restart , he has not put online the ethernet port .
Has any experience or advice on this?