yes you can change refresh rates and see if that does the trick...
But I would not suggest you go under 85 Hz

You can also increase the distance between them

"VeNoM00" <venom00@nospam.it> wrote in message
news:e6GngVXDGHA.528@TK2MSFTNGP09.phx.gbl...
> Hello!
> I've two monitor connected to my PC.
> My problem is: the bigger monitor has a line that goes up and down. I
> think
> the smaller (and older) monitor generate electromagnetic interferences
> that
> cause that line.
> What could i do? Shoul i change the refresh rate?
> Any idea?
>
>