Hello,
I have a rather similar build, but I'm still struggling to get it running.
First, the install failed because some packages couldn't be read from the DVD (retail, I confirm). I restored the DVD to a second partition on the HDD, and it initially failed too, as I also got issues with the packages. Secondly, I copied the DVD to a USB stick, but it didn't work better. Then suddenly the same second partition became usable. I don't know what changed, but at least I can use that for the install.
For now, I can install, run the combo update and setup multibeast, but at the next reboot, I'm blocked with the apple logo and the spinning wheel. I can't see how the iBoot or iBoot Legacy could help me. Also, the safe mode doesn't boot either. From what I have read, and at the opposite of the logs I can find, the most suspicious part could be the graphics card.
For any successful install, which Multibeast setup did you use ?
Cheers,
Hemie143