I just installed FC3 x86-64. It's a dual boot machine with two HD's (one Windows, one Linux). Windows was installed first, then FC3. FC3 boots fine, but GRUB won't respond to keyboard interrupt/input; not during the "countdown", not while in the menu*.
*The boot menu can be accessed by hitting a key at the exact right moment (I've done it twice, entirely by chance), but, once it's there, it doesn't respond.
The BIOS settings can be accessed by pressing DEL at the appropriate time. Keyboard LED's, however, are unresponsive at any time during boot up other than while in the BIOS settings menu.
I have tried 2 USB keyboards and one USB keyboard plugged into a USB/PS2 adapter.
Here are the contents of /etc/grub.conf:
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd1,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
title Fedora Core (2.6.11-1.14_FC3)
kernel /vmlinuz-2.6.11-1.14_FC3 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
title Fedora Core (2.6.9-1.667)
kernel /vmlinuz-2.6.9-1.667 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
PS- The problem has existed since initial installation. The upgrade to the 2.6.11 kernel did nothing.