Hi sjpapa,

Try to install the NVdarwin 256Mb kext for your videocard in a fresh install of iPC 10.5.6 final or iDeneb 1.4 ( you can easily find it on the web ): for my 9300 M GS it's THE ONLY kext driver which enables the Quartz Extreme & OpenGL ; i've tried ALL the others without any results !

Nice day

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Apple's Mac OS X , c'est le rêve !
*New Workstation: 4 Core Intel Q6550 12 Mo L2 o/c from 2,83 to 4,08 GHz ( 8,5 x fsb 480 ) with NOCTUA pipeline aircooler, Gigabyte GA-EP45-UDR3 motherboard, GeForce 8600GT;4Gb Corsair 800 MHz ;2xHDD 500 Gb Samsung ; 22" LCD BENQ ;apple alu keyboard; ANTEC P182 hardcase, iPC 10.5.6 PPF5 after very good result with Kalyway 10.5.2 on my previous Athlon64X2 6000+ on a K9N SLi Platinum
*Compaq CQ70-118ef laptop with iPC 10.5.6 fully working except HDMI output