I just installed Unbunu 13.04 on my mac, and it hangs on boot. It shows the output from loading the usb drivers (and all my usb devices appear to be there) and then stops. Pressing keys on the keyboard produces no input.
Edit: Screenshot: http://i.imgur.com/JKVTBRZ.jpg
Also, I booted from a livecd to look at logs. faillog is empty. dmesg and boot say nothing has been logged yet. Any others I should look at?