Apache server not processing PHP

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http://www.linuxquestions.org – I am running the Linux server ( debian etch ) on a virtual machine since more than a year. About a week ago the mail server ( exim4 ) stopped working. I've started aptitude and made something i cannot remember exactly ( said o.k. to an action aptitude proposed me solving some inconsistencies, but aptitude itself crashed several time with "cannot fork" and "SIGSEGV" ) - since then apache2 does not handle the PHP pages, delivers the php source to the browser. I've tried reinstalling PHP5, but no success so far - php5 is installed, also the libapache2-mod-php5 - The php5 mod (HowTos)