This is not a Fedora question, more a question on BIOS but I hope that someone here can help me.
I can only boot my laptop and netbook from a very old USB stick. When I try to use newer sticks, I don't even get to the first Grub display.
All sticks are prepared in the same way (via livecd-iso-to-disk) and the "boot" flag is set on.
As the only USB stick that works is now around 10 years old and has been washed with the laundry a couple of times, it is time for me to ensure that I can always boot my systems in an emergency.