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I'm also stuck at the PCI Configuration begin error with DP2. And i'm sure it's related to my Sparkle GTX 470. DP2 installs fine with an ATI HD4870 and switching cards after installation results in PCI Configuration begin. So neither booting the installation or booting the os itself works with a GTX 470. It seems like lion actually boots in some way, my HDD leds flash like crazy and i can hear sound from the harddrive. Just no image. the other relevant parts of my computer are the following: ASUS P6t deluxe v2 Intel Core i7 920