Today I woke up and wanted to connect to the internet via my laptop. The current network I have is the DSL modem connected to a WR841ND TP-LINK router, and then connected via LAN port to my desktop PC, and via Wi-Fi to a Laptop.
However, my connection was unsuccesful. I power cycled both the modem and the router, awaited for a stable connection, and tried again with no result.
That's when I noticed the lights on my router seemed strange. While the router's LAN port 1 to the computer was connected and lit, the LAN port 4 was also lit, but it wasn't connected to anything. Then I noticed my wan port showed the same behaviour, since it was already unplugged, but its light was still on.
That's when I decided to do a factory defaults reset, a hard reset, and reuploaded the firmware to the router. No change at all.
I decided to connect my DSL modem to the computer directly, and internet works like a charm, so everything points to the router as the source of the problem.
Now, I wanted to know. What would be the procedures I should follow to test or repair the router before declaring it "deceased"? Could this be more of a firmware problem? A hardware one?