I've got the 13.04 live disk, 32-bit Xfce version. When I try to run it, it ends with a lockup. The disk is OK: I checked.
If I start in the console mode, it works. If I then try startx or xinit, I get a quick flash of unreadable messages followed by a blank screen and a lock-up. And it's a complete lock-up: I can't get to tty2 to see what's happening; all that works is Alt-Sysrq-b.
I've tried the safe mode, using nomodeset, and replacing the video parameters with xdriver=vesa, but nothing helps. My video is just an SiS chip on the motherboard, so the VESA driver should work.