Is it possible to connect two external monitors to a 2013 Slim iMac? I've got two ThunderBolt Ports. I picked up two thunderbolt to DVI cables (not adapters). I've tried using a TB to VGA and a TB to DVI to no avail, and also a TB to VGA and a TB to VGA and I can only get one monitor working at a time. It comes down to whichever one is plugged in first. On a side note this occurs in Mountain Lion as well as Mavericks, I'm back at Mountain Lion on this machine now. How do I get this to work?