hmmm there isn't much here that could be stopping it.. the only other thign in the bios I can see that could be doing it is
"Init Display First"
by default its set to PCI.. setting it to PEG _might_ stop it from trying to use the onboard for detection since it'll succeed with the PCI-E card.. but I am clutching onto straws here (ie I'm doubtful that'l change anything). is the Bios actually reporting 4GB of ram too? not sure if you've answered that yet, if its not 4096MB then we have issues with ram.
I'd really love to dig around your device manager right about now.. *preps plane ticket*







