kernel update - reboot hangs with GRUB

[Sy Beamont <sbeam attbi com>]

Just installed FC1 fresh on my laptop - did a 
# yum -y update
which updated the kernel among other things. On reboot, nothing comes up 
but "GRUB". Sort of like good ol' lilo hanging with LI or whatever. 
This is a basic dual booter with W2K and NT boot loader on the MBR. Can 
anyone clue me in to what this means - trying to find the pertinent 
grub docs right now w/out much luck.

thanks

-S