I didn't look through all the search results, but I don't want to *assume* anything, so please do not take any offense at the following questions (some of these were covered in different threads):
Did you check ownership and perms ?
Check the httpd.conf AddHandler ?
Ah damn, my mind just went blank on the other questions, and I'm too tired to read the other post results myself right now. Sorry.
Hopefully I'll remember this thread after I get some sleep. Otherwise, sorry I didn't have better suggestions.