Apple Mac Power PC problem

Hi all, I noticed on a clients Apple Mac Power PC that his php driven website wasn't working for him. It wasn't loading up at all, in fact it was returning an error that the URL could not be found. I discovered a quick fix for the problem, that is to create a index.html file and run a meta refresh to index.php, this seems to work. Something in the headers php sends seems to screw up Power PC's resolving method. The headers I send are: header('P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"'); header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Cache-control: private"); header("Pragma: no-cache"); and what's being received is: HTTP/1.1·200·OK Date:·Thu,·01·Apr·2004·08:46:00·GMT Server:·Apache/1.3.27·(Unix)··(Red-Hat/Linux)·mod_jk/1.2.0·mod_perl/1.26·PHP /4.3.3·FrontPage/5.0.2·mod_ssl/2.8.12·OpenSSL/0.9.6bX-Powered-By:·PHP/4.3.3 Set-Cookie:·PHPSESSID=8ebf6b7d4895473a054bb8f50b2a66dd;·path=/ Expires:·Mon,·26·Jul·1997·05:00:00·GMT Cache-Control:·private Pragma:·no-cache P3P:·CP="NOI·ADM·DEV·PSAi·COM·NAV·OUR·OTRo·STP·IND·DEM" Last-Modified:·Thu,·01·Apr·2004·08:46:00·GMT Connection:·close Content-Type:·text/html Is there anything in these headers that could cause Power PC's to fail resolution? Thank. Marc.