No broken switch/sensor. Problem solved. I found the same question in notebook review.com.
I turned off the service - Ati Hokey Poller. Turn it on again and everything works turn. LCD turn off again when lid close.
Yes. The screen should go off even the option in Power scheme is "Do nothing". I haven't change anything but now the screen didn't go off.
I don't know whether the screen turn off is controlled by some Dell tools. Last night I...
I have tried to set to suspend when close the lid and it functions well. But when I change it back to do nothing. It really do nothing rather than turn off the screen. I think the detection on turn off the screen did not have problem.
Originally Posted by L7frost
although this doesnt really "solve" the problem per say, what I do when I want the LCD to turn off when I close the lid is to go to the power properties and set the LCD to...
Originally Posted by roro
wth? that doesn't really solve the issue... what if you want to leave the computer on? (e.g. you are downloading something, or you want to stay signed on to aim)