I had a similar issue with my x230, installation went ok, but then on reboot, Qubes just hanged. I discovered it was a bios issue, eventhough in the x230 bios version 2.51 shows that Vt-d was enabled, it wasn't so. After I upgraded the x230 bios from Lenovo site, I did a re-installed of Qubes 4rc5, and Qubes works.
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