Same issue: booting from the LiveCD (Desktop) with any set of options causes the system to lock just as X should be starting.
Both the x86 and x86-64 CDs exhibit the same problem (notable: the usplash on the 64-bit version appears in shades of grey, with graphical artifacts). Test Specs: ATI Radeon 9200 SE video card ViewSonic 19" LCD monitor ASUS K8V SE Deluxe mobo AMD Athlon XP 64 3200+ 1GB RAM -- Install 6:10 Failure: Black screen at Live Desktop Stage https://launchpad.net/bugs/67487 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs