After upgrading from a 2011 MacBook Air to a (refurbished) mid-2013 MacBook Air, I'm getting odd behavior with my external Dell 2240M monitor.
Whenever my laptop wakes up, if the monitor is already on (usually asleep), there are this static-like white dots dancing all over the screen. If I cycle the monitor power with the laptop on, they go away.
What causes this? Does the newer MacBook Air have some incompatibility older monitors?