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One phone jack not working


One phone jack not working

Just got my ADSL activated and received my router this morning.

It works fine - on every phone jack in the house except the one beside the computer! Now, there's always been something funny about this one jack - not all modems will work on it either, although it's fine with phone handsets. For instance, my desktop (PCI) modem works fine, but my laptop's built-in modem won't work. The laptop works fine on every other jack in the house, too.

As far as I can see the wiring to all the jacks is fine. I'm aware that there can be polarity issues with the wiring, but don't know how to test this. Any ideas how to proceed? Or what I can test? Or how?