Using Ubuntu-12.10 and tried Xen 4.2.1 and Ubuntu''s Xen with same errors. Since Xen never boots successfully - there is no log message. So I captured the output with video and posted screenshots at http://skippyvondrake.com. Maybe it''s a hardware issue. The motherboard has Intel chipset x58 (if that helps). The first message of interest: hda_intel: azx_get_response timeout Followed by stuff like "failed command: READ FPDMA QUEUED" And near the end: ni_cp: Failed to load firmware "radeon/TURKS_pfp.bin" disabling GPU acceleration -Skippy