I today bought rb450g and when i attached it on power all 5 ethernets ports blinks, and I can't connect to routerboard via ethernet.
Does anybody know what is a problem?

What is the output on the serial console?

HI,

try to netinstall it, but it isn't normal..

how much power are you feeding it and how?

12V via connector.

Try to connect this routerboard with serial console and check whether all ethernet ports are enabled. Or simply netinstall to the newest version as suggested before.

I solved problem. Problem was in dc adapter.