Weird display problem

[Ragnar]

I have a weird problem with a t520. The output to the screen quit working. Once I cleared the cmos I could output to a monitor. But still nothing on the screen. Then I unplugged a plug on the motherboard and the screen works. Plugged in I get nothing.Unplugged it works fine. Below is a pic of the plug.
My suspicion is the nvidia gpu crapped out and despite being set to onboard graphics only the gpu is thwarting the output. But i really don't know.

[RealBlackStuff]

Can you be a bit more specific?
Where does that cable go to?
Where is the location of that plug?
Your picture covers too small an area to get any decent view.

[kfzhu1229]

That's the microphone webcam LED indicator cable, which I believe also contains the lid sensor.
So if that cable unplugged the problem solves, then I believe the lid sensor is your problem.
Apparently this is like the 2nd case in a month of such problem. Don't know why they out of all the components fail.