If you have downloaded the Fedora 16 Alpha and pulled in the latest updates, you probably ended up with a file not found message instead of your GRUB2 menu when you rebooted. The offending package is grub2-1.99-1.fc16.x86_64.
The problem seems to be due the update removing GRUB2 .mod files.
If you have not yet rebooted your system after updating, simply run
If your boot disk root partition is not /dev/sda1, replace /dev/sda with the correct device path for your root partition.
If you have rebooted and hit this problem, boot from a live CD in rescue mode, mount your root partition and run the grub2-install utility.
# mount -t ext4 -o rw /dev/sda1 /mnt # grub2-install -boot-directory=/mnt/boot /dev/sda1
and reboot your system.