what if a girl responded? anyway, you should build the kernel by hand, but since the rpm installed, then it is just a grub configuration. you didnt say what distro you are using, so i cant help you beyond telling you to find the kernel bzImage that you are using, and see if the new one is there as well. usually a kernel will be in /boot and named vmlinuz. are you sure you arent using the kernel that you installed? you can find out by typing:
into a terminal. it should say something like 2.x.xx.xx for whatever kernel you are currently using. if you originally had a 2.4 kernel, and you upgraded to a 2.6 kernel, then probably the rpm install just overwrote the symlink for /boot/vmlinuz. you can check this by typing:
ls -l /boot/vmlinuz
into a terminal. it should tell you where the symlink is pointing. some systems will define the version like this:
or whatever. it should tell you, as long as that is where the bzImage and symlink are. sometimes they are in /.
when posting it is a good idea to give as much detail as you can. like:
i am using fedora core 4 with stock kernel 2.4.26 and i tried to bla bla bla....
i have also heard that you have to reinstall grub after you edit the file. not usually as grub doesnt need this, but some versions of grub do need this. so use grub-install at a command line.