Ethernet Connection not detected

I have this strange situation with my connection.  I had an Arris Modem and R6250 was hooked up with that. During a thunderstorm, I saw that there was no power on my router. Sure enough, the AC adapter was dead. I tried hooking up my modem to my laptop via hard wire and no internet connection. So I bought a new modem and power supply for the router. After configuring the modem I was able to get the internet connection on my laptop via hard wire but router kept saying no ethernet connection. I am assuming that the power surge killed the Ethernet ports both on my modem and router? But the strange issue is that I had another (very old) router laying around and that also gave the same error when hooked up to the new modem. 

I bought a new router (R6400) and that does work. I just wanted to make sure that the R6250 can not be fixed before I throw it away. Any ideas how to approach this?