SO see the attachment. this is the menu you should get to edit the grub boot option.
to get to that menu keep tapping on the UP or Down key on your keyboard right after you see the initialized HDD's in bios.. simply not right after you start PC but just abit after.
so youll get that menu you need to hit E button.
you will see something like that (but only for with your distro details.) :
title Fedora (2.6.35.9-64.fc14.i686)
root (hd0,0)
kernel /vmlinuz-2.6.35.9-64.fc14.i686 ro root=/dev/mapper/ncmsrv-root rd_LVM_LV=ncmsrv/root rd_LVM_LV=ncmsrv/swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=uk rhgb quiet nouveau.modeset=0 rdblacklist=nouveau
initrd /initramfs-2.6.35.9-64.fc14.i686.img
on this line add:
kernel /vmlinuz-2.6.35.9-64.fc14.i686 ro root=/dev/mapper/ncmsrv-root rd_LVM_LV=ncmsrv/root rd_LVM_LV=ncmsrv/swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=uk rhgb quiet nouveau.modeset=0 rdblacklist=nouveau
init 1
Hit enter. > Hit B key to boot