First, there is no such thing as Red Hat Linux 9 Enterprise it is Red hat Linux 9 and it has been EOL'd for more then 2 years (EOL == end of life == not supported)
Second you hardware description is lacking you might find that reading this to be helpful in the future;
http://www.linuxquestions.org/linux/...Ask_a_Question
Third the default bootloader for RHL9 is grub not lilo, you might have selected lilo during the installation process but that is not important.
Finally, like I said RHL9 is no longer supported. I'm glad you got as far as installation but you should really be using a modern supported Linux OS, if staying with the Red Hat family consider the Fedora Core 5 or 6 version or the CentOS or Scientific Linux 3 or 4 version. Both the last two are freely available work alike binary compatible clones of RHEL 3 or 4 (the real enterprise version of Linux by Red Hat) respectfully.
http://www.centos.org/
http://fedora.redhat.com/
https://www.scientificlinux.org/
If this AMD CPU on your system is a 64-bit processor then it might be advisable to download and install the 64-bit version of the OS.
Reinstalling Linux unlike Windows is not needed most of the time (about 99% of the time BTW). From your description of the problem most likely your hardware is far to new to be properly supported by Red Hat Linux 9 kernel.