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M4400 screen won't turn off when lid is closed

Discussion in 'Dell Latitude, Vostro, and Precision' started by Van Adam, Sep 15, 2009.

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Van Adam Newbie

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Whenever I close the lid, even on the BIOS screen, my screen won't turn off. Instead, it seems that the back-light comes on at full power and whites-out the screen.

This also happens when computer is set to turn off the screen in Windows.

Since this occurs on the BIOS screen (when Windows is not yet running) it is not a Windows-related issue.

I am wondering if anyone else ran into this problem and what might be the solution.

Thanks.

Precision M4400, T9550, A15 BIOS
Nvidia Quadro FX 770M, RGB LED LCD 1920x1200
Integrated Webcam
2x2GB Patriot memory
Panasonic DVD+RW UJ862A
Intel Wifi 5300

Windows 7 x64 RTM
Nvidia 190.38 Quadro drivers from Nvidia
Latest Windows 7 drivers from Dell for other hardware

Van Adam, Sep 15, 2009

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