Thanks for your reply. I'm currently not using Chameleon on this test setup. I use it on another mini though. Sorry about the confusion.
I've tried to reset the nvram/smc with no success. However, I think it have something to do with the kernel extensions. I re-built the USB drive and did the steps to allow my board ID, I then did not add the GMA950 kext (which I did previously) and it booted up the installer! Howerver, adding the kext made it fail again and then even removing the kexts doesn't help. I'll re-build the USB drive again....
It's okay to remove (not add) them. The installer would not benefit from them at all! To install them you would need to apply them to a running Mavericks installation anyway. (Although in this case you would not benefit neither due to the incompatibility of such old drivers to a new system.)
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