Okay edited the com.apple.boot.plist, no change. Edited the geforce kexts, and added in nvenabler, edited it with my pci I'd, 0295, repaired permissions, rebooted, I get a blue screen for a couple seconds, then it goes black with a live cursor.
Is leopard just not compatible with the 7950 512mb card?

Looking in the snow leopard kexts, the pci I'd is in the kexts, so I'm thinking of trying snow leopard again. I uninstalled it because it would boot with a ioatacontrollerdevice blocking bus error. Though It did come up once but was very glitchy.

Any ideas? And about editing dsdh, how?

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Hack Pro:
AMD Athlon 64 Dual-Core X2 5600+ 2.8GHz
Asus M2N-SLI Deluxe Motherboard
8GB ram (4x2GB DDR2-800)
XFX Geforce GT240 1GB DDR5
500GB SATA HD (Snow Leopard 10.6.6)
250GB SATA HD (Windows 7 64bit)