Why doesn't ether3-5 mikrotik connection work?

Question

Mikrotik

Good afternoon, I have a mikrotik RB951G-2HnD, set up the router, everything worked.
One fine day, the Internet fell off by cable, and wifi worked.
Ceased to start up through winbox.
I dropped the settings and set it up again, but the trouble is,
1, 2 ports work and wifi, but ether3-5 does not, when the computer is connected, the cable is not connected.
What is the reason?

Answer 1

Apparently the interface is disabled. Check in winbox that the enable button is pressed.