Second monitor showing background but no content
Strange issue happening here:
I have a Philips monitor hooked up to my Macbook Pro (OSX 10.9.2). It was working fine, and then all of a sudden it stopped working. I tried another cable, and it would turn on and display the background - so there was a cable issue - but now it won't show any windows or content on the second monitor. As in, if I drag something over to the second monitor, it won't show it at all.
How can I get this to work again?
MacBook Pro, OS X Mavericks (10.9.2)