white 'static'(?)

[fini]

OK I've always had this oddity, but its only just annoyed me enough to post about it. Whatever channel I'm watching at the top of the screen (about the top 1/6) I get white lines appearing and disappearing almost as if they were static. If there is picture there (i.e. no letterbox) then they are less noticeable and seem to be somewhat coloured by the image there. I'm almost sure its not static for two reasons. Firstly, I've recently moved and still get the same issue. Secondly, it doesn't happen with other tv apps.

I'm using a Hauppauge 350, any ideas?

fini