When I'm at work, I have my Dell Precision M4500/Windows 7 machine on a docking station, lid closed, and displaying on dual external monitors. I put the machine into sleep or hibernate to travel. But, when I try to bring it back up without the docking station, it acts like it's still trying to display on the external monitors--the laptop screen itself is dark. The only way I've ever been able to use it after a hibernate without the docking station is by either doing a hard shutdown, or putting it back on the same docking station.
The laptop screen is active while the waking-up process works (i.e. I can see the logos and the words "Resuming Windows") but after that I just get a screen showing black. Note that the laptop screen is on, rather than disabled--it just shows a completely black screen.
If I shut the machine down on the docking station, then it starts up just fine by itself.