Monitor //c is rolling

[mcdermd]

I have a monitor //c. It's nice and bright and works really well except for the fact that there is a slow rolling, horizontal wave that sweeps from the bottom up. It takes maybe eight or nine seconds to complete a cycle. Any ideas on where to look first?

 

[mcdermd]

Never mind, I switched the cable and it's fine. Must have been some poor shielding or something.