That's a Fedora bug.
As you can see, the boot media is looking for a root device at
i.e. a disk/partition whose UUID is 3C35-YBC3. But, following the instructions for creating a bootable USB drive, the UUID of the partition will be random, and certainly not the correct value.
The solution is to:
1. Make sure the USB boot drive has a label. Plug it into a Windows computer, and if it shows up in My Computer with a name other than "Removable Drive", it's got a label. By default the label is probably "FEDORA". If it doesn't have a label, simply rename it in My Computer to give it a label.
2. Boot from the USB drive. When it says system will start in 10 seconds, press Enter to get into boot menu, then press Tab to edit boot options. Change "UUID=3C35-YBC3" to "LABEL=FEDORA" (or whatever label the USB drive has), then boot. http://blog.subuya.org/?p=14