Unplug the cable at port 1 or the TP link and see if that works on a laptop. If it does, then the switch is down. You didn't write it if the power is showing.

If it does not, then use a factory made cable at the E2500 to port 1 to your PC for a test to see if the router port 1 is dead.

I find most of the time it's home made cable failures.
Bob