I have burned 4 different copies of 13.10 to DVDs and, when I run the live DVD, to try it, I get gibberish on the bottom half of my screen (black on top half). These copies were downloaded and burned at different times either in Windows 7 or in Ubuntu 12.04. The gibberish has occurred all four times. The last time, I downloaded the .iso, double-checked the md5sum, burned it with K3B to a Memorex DVD+R, and had K3B verify the write. It was okay, but I still get broken patterns on the bottom half of my screen. What am I doing wrong?