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My guess would be that one or more of the pin sockets on the svideo from your laptop has a loose/broken connection. Jiggling it gets it back in contact.
It's probably going to get worse or at some point jiggling will no longer offer a temporary fix.
I'm not real familiar with a laptops innards but looking at a desktop graphics card suggest this will not be an easy fix. Before integrated circuits and boards you could probably get out the soldering iron and fix it, but I don't think you'd be that lucky today.
I have a power supply socket on a laptop that is the same way and have been told by repair people that this is not a cheap fix.
Sam
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