DSL modem and wifi router question

[Gidney N Cloyd]

I had to get a new DSL modem this week due to some storm damage (apparently fried by power surge). I just tried swapping around the ethernet cables to fire up the wifi router and I lose internet connectivity (going back to direct connecting the modem to the desktop computer restores the connetion).
My worry is that the router also was damaged so I can't just assume I need to reinstall it. Do you typically need to reinstall a wifi router if you replace the modem?

[Why Syzygy]

1. Just an idea ..

Do you need to change the mac address of the new modem within the router? When I had ATT DSL, I had to input the mac.