I had 2 harddrives /dev/sda and /dev/sdb, in sda I had windows, and apparently that drive died.
So I removed /dev/sda, an booted with the fedora 16 DVD, chrooted to /mnt/sysimage, checked if everything in /etc/fstab was not pointing to /dev/sdb because my second harddrive should be now /dev/sda.
I checked /etc/default/grub and it seemed ok.
Then use grub2-mkconfig -o /boot/grub2/grub.cfg
Rebooted the computer but I just get a "-" flashing like grub is not recognized.