Huh, seems like most kernel users are having video issues.
I can't boot with GraphicsEnabler=Yes, otherwise the monitor loses the signal when entering the gui (GeForce 9800GT).

Same result with the G92 enabler in iAtkos, rom injection, efi string, changing NVCAP, nvenabler 64, DSDT and nvidia official drivers from nvidia web site.

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System

• MoBo: MSI K9N2GM-FD, Chipset GeForce 8200 (MCP78)
• CPU: AMD Athlon 64 X2 5200+ @3,02 Ghz
• RAM: Kingston 2GB DDR2 800Mhz + Corsair 2GB DDR2 800Mhz @747Mhz
• VGA: EVGA 9800GT SSC
• HDD: 300GB WD SATAII
• Optical Drive: Sony SATA 24X
• OS: Vanilla Mac OS X Server 10.6.0 + Nawcom ModCD, upgraded to 10.6.8 and Windows 7 x64.

Everything works, except sleep, so system isn't Energy Star compilant .