Well theres like 15 kext to delete but dunno which one have to delete exactly, but another way try to but in safe mode or force to fix it and install the right one, whats your video driver? are you on 10.5.2? did you used the right driver? as you know Im using 8600 GT, and this driver is just for 8400 to 8800 GT.

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HP Pavilion Elite m9250f
iAtkos v5i (10.5.8), Asus IPIBL-LB MOD BIOS, Intel Quad Core Q6600, 4GB RAM (800mhz), 2x500GB, nVidia 8600GT (Works), ALC888S (Works), Wireless RT73 (Works), LAN (Works) - How to Install - Blog - Hardware Combos - FAQ by TJ2K7
Macbook Pro 13"
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