MBP external monitor won't reconnect when waking from sleep

in Genius Bar edited January 2014
I have a new MacBook Pro connected to an external monitor (Dell 2407) via a Mini DisplayPort to DVI adapter.

When I restart the computer, the external monitor connects as it should, but when I wake the computer from sleep, only the built-in screen turns on. I've tried disconnecting and reconnecting the adapter (the built-in display flashes blue for a second as it would when changing configurations) and using the "detect displays" command, but nothing does the trick.

Any ideas what could be causing this?
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