we need detailed models of all your hardware to start:

CPU:
MotherBoard:
Graphics Card:
RAM:
any other components like wireless cards and things as well

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iMac ::: Mac OS X 10.6.1 ::: Intel Core2Duo 2.93GHz ::: NVIDIA Geforce GT 120 256MB ::: 4GB DDR3 RAM

Milanca Project ::: Mac OS X 10.6.1 Retail ::: Vanilla Kernel ::: Intel Core2Quad Q6600 2.4GHz ::: NVIDIA GeForce 8600 GT 256MB ::: 4GB DDR2 RAM ::: GIGABYTE GA-EP35C-DS3R