Did you try to boot the machine from your Mac OS 9 cd?If it comes up, then the computer board/memory are ok.Does the hard drive icon show on the desktop?If so, open it and use an external disk drive to save your data (programs can be re-installed from the original cds).
Now use the disk utility program on the system cd to check/repair the hard drive.It may have to run more than once to fix everything.If its able to fix things, then try re-booting the computer from the hard drive.
If that still doesn't work, try re-installing the system from the system cd.
Otherwise, contact someone who is more familiar at troubleshooting. If you were in SE Indiana I might be able to help...but Ifrom your message I have no idea where in the world you may be located.