my lenovo w500 will not boot without external monitor connected

I've got a lenovo w500 that was working fine with windows 7 rc. Now, when it is docked with an external monitor connected, it boots fine. when there is not monitor connected, it seems to boot, but with no video on the notebook's screen. When it is docked, I do get video on the notebook screen (in additional to the remote screen).

I feel it's related to the boot profiles. Is there anyway to clear the boot profiles so it can figure them out again from scratch?

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