Comment 7 for bug 617779

From http://my.opera.com/toman/blog/setting-up-squeezebox-server-on-new-hardware:
After some fiddling around with the syslinux config files and still not getting it to boot properly, I found a deceptively simple workaround for this: Just type "help" on the BOOT prompt, and when you get the help menu, just hit enter. The system will now boot!

Confirmed that this also works for me when booting a USB stick created by 10.10's USB creator.