Test Billing Script Install

I have a new dedicated Linux/Apache server running Ensim X. When I got this server from the host there was initially a problem with ensim setup, which was corrected. Next there was a problem with mysql, but it has also been fixed. The problem is now that I cannot seem to get a simple billing script to work on this server. I use a couple simple billing scripts that tie into my merchant account. I have used them for years and I am very familier with install/setup. But on this server they simply will not work. This server is the exact same software configuration as the other servers I have used with this billing script. So now I'm thinking it's the server, however I really do not know enough about Linux/Apache to nail it down. So I'm looking for someone knowledgable in installion and Linux. I would need you to first install a simple billing script and see if you can get it to work (just in case it's not the server but my installation). If the billing script does not work I would need you to dig around apache to see what could be preventing it.