hello,today i installed Snow leopard with Iatkos but when i first booted OSX i saw the apple logo and the loading things below it,then the screen goes black as if there was no video input.

im pretty sure its something to do with my grapchis card Geforce GTX 275.

so please help me im a newbie and i never did this before.

thanks in advance and sorry for my english(isnt my main language)

First thing to check (if possible) is another methods of video output. I mean the VGA, DVI and HDMI ports.

If it's not possible, then try messing with Chameleon's Graphics Enabler parameter. (to disable it type "GraphicsEnabler"="No" in boot)

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My Hardware
CPU: Intel Celeron G530
Memory: 4.00 GB DDR3 1333Mhz
Graphics: NVIDIA GeForce GTX 550 Ti
OS: Mac OS X Lion 10.7.4 - Vanilla kernel
Motherboard: Gigabyte GA-H61M-D2-B3