Wait you have the ASUS A8N SLI Mobo in a slimline case? or do you have an ASUS A8N-BR which comes with that slimline model? It may also be labeled Pyrite-GL8E?
http://h10025.www1.hp.com/ewfrf/wc/d...08&lc=en&cc=us

And you try nForceTest for the chipset? It looks like it is the integrated graphics card.

A little research over on InsainelyMac shows a few users with the same model. Im guessing that this first one is you?
http://forum.insanelymac.com/index.php?showtopic=140090
The second user I found is more promising as he reported using installing Kalyway 10.5.2 and then having issues related to LAN.
http://forum.insanelymac.com/index.p...2327&hl=s7700n

Im not sure what the device ID is for your integrated graphics but if we could find this out we could see if it is included in any of the nForce drivers.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
Monitor: AOC Q2963Pm 29" WFHD 2560x1080 21:9
Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves