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Black screen from DVI on 8400GS video card...

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I'm having a lot of trouble with my Nvidia 8400GS 1024MB (DVI, HDMI, VGA) video card on 10.6.8 Snow Leopard. If I plug my display into the VGA port, everything works fine, but I get a blue screen when changing the resolution (or when the resolution is changed by an app) so this isn't an acceptable option, and if I plug it into the DVI port (primary) I get nothing but a black screen after the grey apple logo.


To get the video card to work at all I added the device ID to NVDanv50HAL.kext and used GraphicsEnabler=Yes and npci=0x3000 at boot but everything else is unmodified. I can give any other information about the system if needed...


Can anyone help me? :(

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