STOP FLICKERING. NO REALLY STOP

Aghhh does anyone have any tips for where to start troubleshooting a flickering dual monitor? It's getting pretty bad, and I'm two seconds away from throwing the entire thing out the window.

...okay, maybe three, but that's it.

Maybe I should switch from DVI back to VGA? :( I don't recall it being this bad back when I was using the VGA connector.

ETA: Switched back to VGA and I think that's fixed it \o/ So much less pent-up frustration now!