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Toughbook cf-53, trouble with LCD


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i have a toughbook i've been getting up and running on 10.8.4.  i have everything working but the onboard LCD, it uses intel 3000.  it goes blank after the apple logo.  only the HDMI at that point shows a display.  if i use HDMI its all fine but the LCD is not recognized and cannot be detected.  i've seen posts about changing a value with hex fiend in AppleIntelSNBGGraphicsFB.kext but that produced an unbootable system.


i can find no dsdt for this model and dont know what else to try now.


any help with this would be apprecieated.



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