I recently downloaded the Fedora 21 XFCE4 Alpha iso and used the LiveUSB Creator to write the iso to a USB disk. When I tried to boot the USB image I hit an error I haven’t seen before:
vesamenu.c32: not a COM32 image
The quick fix is pretty simple, but not at all obvious: just provide the kernel and arguments manually:
vmlinuz0 initrd=initrd0.img root=live:CDLABEL=LIVE rootfstype=vfat ro rd.live.image quiet rhgb rd.luks=0 rd.md=0 rd.dm=0 nomodeset
Just type the above in in the “boot:” prompt (all on one line) and it should boot the image to a desktop. Not sure why this happens but it is Alpha.