Screen goes blank with slightest movement of the lid; problem related to hidden sensor

I posted this in the display section but got no answer. Because it's hardware related, I am giving it a try here;
The problem occurs in the following 3 ways:
- Vista: when the lid is moved back and forth a *little* bit, the screen goes blank/black; restore is possible by first closing lid, waiting a few seconds till the lid light dims; then quickly bringing the lid back in position and press any button brings it back to life
- Windows 7: almost identical, exept no button press is needed; this could be a settingin power scheme, I didn't check because it's not so relevant
- Linux: same but no way to bring it back to life again; reboot system is only possibility
This means the magnetic sensor in the bezel that deactivates the system when the lid is closed is still working, but I don't understand why the screen becomes black when it is slightly moved back/forth ? I have read about some sensor hidden behind the hinge depending on the model but very little info how to solve the problem
Could someone explain what is happening and how to find the cause ?

If only I could understand what's going on that would help me A LOT. I understand this is difficult, but there must be some HP expert who knows about this issue. Understanding the problem is the first step.
What could be useful for me to know is where exactly is that sensor, how to locate it, how to test it, what is the module or part to replace it if needed etc.
Here are the notebook and its specs:
http://www.cnet.com/products/hp-pavilion-dv7-1299eb-17-core-2-duo-p8600-vista-home-premium-4-gb-ram-...

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Screen goes blank with slightest movement of the lid; problem related to hidden sensor

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