what do your Apache Error and Access log files show?

BTW: I upgraded my Apache, MySQL and PHP on my RH9.0 Linux server and it really wasn't that bad.

The MySQL was easy, just used the RPMS for Fedora.
As for the PHP, had to compile and configure that as well as Apache.
Currently, I run
PHP 4.3.9
MySQL Server 4.0.21
Apache 2.0.52
on RedHat 9.0