Did you try unplugging the TV from the wall for a minute or so? Sometimes with the electronic monsters, just making them reboot solves problems. Turning them off doesn't do it since they still draw current when turned off.
Also, if you haven't tried it already, make sure the cables are tight between the wall and cable box and the box and the TV. If you have a VCR or TIVO in the mix, check that connection as well.
Did the cable company come out or just boost signal from the main office? Perhaps there is some leakage at the main box that serves several homes.
Sorry I can't be more specific. These are just some things I would try.
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