With the internet light not lit up, the only thing I can think of now, is a faulty lead or lead in the wrong port (done that before myself lol). Might be worth just double checking the right cables are going in the right holes
Modem > router (WAN)
Router > computer (LAN)
Not trying to imply anything, I just know i've done it before and it took me ages to figure out i'd done it wrong.