I'm not sure if this is also a place to ask hardware related questions, but I'm having scanline problems with my monitor when my laptop is plugged in the power socket. What can I do to make that problem go away?
The best way to make it go away is going to be to use a DVI cable instead, but that may not be a possible solution.
Alternatively, try swapping your VGA cable to a higher quality cable, and make sure that your outlets are properly grounded electrically. There could also be a grounding problem inside the laptop or the monitor itself, but that's not something that will be user-servicable.