PHP was working fine, then out of the blue it just stopped parsing files

I have apache/php/mysql all installed and working just fine. The phpinfo page was parsed properly, my test pages and sample scripts I learned from a book worked just fine, two weeks ago. Now tonite I load up that very same page and the php scripts no longer parse, I just get the code instead. The server has not been rebooted, or interrupted in any way. I tried a new small script, a counter, but it will not work, the phpinfo page does not work either. What should I look for to fix this? I restarted the web server to no avail, then rebooted the server, no good. I checked the httpd.conf and it is still the way it was two weeks ago when php worked fine. -- Chip W. www.wiegand.org Alternative Operating Systems