Failure to interact with MySQL in Redhat 9 ?

Hello all. I hope this is the best place to ask this (!) Problem: verified that PHP, MySQL and Apache are all working fine. My first little project, and search.html and results.php is not working in Redhat 9. If I fail to enter a search term, I get the expected error message, but that is just Apache, it's not even executing any PHP. When I enter a search term, the results.php page loads with the proper page title, but the rest of the page is blank. **However**, the exact same project files work just as expected on my Mac running OS X though... hmm: which is running Apache 1.3, PHP 4.1.2 and MySQL 4.1.2 So I have to wonder, what am I missing in Redhat ? What I've done, what I'm doing: I am learning MySQL and PHP, working through a lovely O'Reilly text. I have MySQL and PHP and Apache all working fine on an istall of Redhat Linux 9. I can work with MySQL in the terminal (command-line), and have even installed MySQL Control Center (a fairly nice GUI). My "hello.php" loads fine and returns "Hellow world" in my web-browser when I load http://localhost/hello.php The default Apache page loads, as do a simple index.html file when I put one in place. Apache 2 is running, PHP is version 4.2.2, MySQL is 4.0 ==== I checked permissions and ownership of the "search.html" and "results.php" files. My "results.php" file is setup the same (ownership & executable flags) as my "hello.php" file (which does work). My Apache error log offers nothing helpful. I cannot find any MySQL error log in Redhat (checked and triple-checked), and I can't seem to find any php error log. The php.ini file really doesn't help, in terms of knowing where to look for an error log === I know this is long, but I've been as thorough as I know how to be - please help ! (TIA)