I just moved into a new rental house that is wired with Cat 5e. I was able to get all the jacks to work except one (of course the one located right by my TV and HTPC, the second most important one, doh!)
I don't have any testing equipment so I took some picture hoping to get some input on what is wrong. In the closet upstairs is an RJ45 terminated end, and downstairs by the TV is a punchdown wall box.
There's two cables upstairs that it might possibly be (and I'm not positive which on it is), so I included pictures of both.