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LCD becomes black at OS boot


at power-up the LCD is white/gray with the Apple logo, then the loading logo (rotating circular segments). Then the display turns black. Everything works perfectly on an external display. I tried to change the LCD, the result is same.

What could be the problem ?

Thank you for your help.

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thank you Dan. No it doesn't help (I used the procedure with removal of the battery).


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Did you reset the SMC? its just possible the display setting is set at the lowest brightness setting. Heres the Apple TN on how to do it Resetting the System Management Controller (SMC)

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OK - Try this, after booting using the keyboard brightness buttons lower the brightness to the lowest setting. Then slowly raise it does it light up? Also if you use a flashlight though Apple logo can you see your desktop image?


No, both operations don't show anything.

By the way, here are the graphics properties (with the external monitor L72D connected):

GeForce 8600M GT:

Chipset Model: GeForce 8600M GT

Type: Display

Bus: PCIe

PCIe Lane Width: x8

VRAM (Total): 128 MB

Vendor: NVIDIA (0x10de)

Device ID: 0x0407

Revision ID: 0x00a1

ROM Revision: 3175


Display Connector:

Status: No Display Connected


Resolution: 1280 x 1024

Depth: 32-Bit Color

Core Image: Hardware Accelerated

Main Display: Yes

Mirror: Off

Online: Yes

Quartz Extreme: Supported

Rotation: Supported



If you don't see a ghost image of your desktop with the flashlight your LVDS cable or the display is bad. As you replaced the display (hopefully with the correct one) then the cable is likely bad.


That was also my reasoning: I checked the LVDS cable wire-by-wire, and its seemed OK. What puzzled me in the graphics properties is: "Display Connector: Status: No Display Connected", as if the LCD doesn't enumerate.

It is a correct one, it behaves exactly as the original.


Did you put the LVDS cable in upside down? If you did, you might have blown the fuse links (near the connector) marked with a letter 'P.


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