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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?
My computer can beat up your computer.
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My computer can beat up your computer.
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