Quoth Anriana
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He may very well know how to connect using the cables he was supplied but those cables from his router company may be very different. A Cisco DSL modem I received years ago came with 3 "Ethernet" cables. These were clearly described in the manual. One was the usual Cisco light blue for the console port and required the rj45 to 9 pin serial adapter, the purple patch cable and a yellow crossover cable. If you didn't read the manual or look at the cables closely, you'd think they were the same. Additionally, because it was Cisco and this was before the 100baseT standard of auto-switching was implemented, you could not connect the router to a switch or hub without using the crossover cable. Come to think of it, since I never used the patch cable, I don't know why they had the purple one in there since you can't connect a PC to the router without it also being a crossover. Oh well.
If your user is unwittingly using the wrong cable, he won't get a link light. If your user's hub or switch has a shared port, where one of the hub/switch ports was physically capable of two connections but electrically only suited for one of them, then he will fail to get a link light. If your user is trying to utilize an ACTUAL ROUTER, then it will (usually) only have ONE ethernet port. The other port may be for console or uplink to the phone or cable company.
Next time you speak with him, ask for make/model numbers on the router. You can google it then and make an informed suggestion.

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