It's always worth adding "use strict" and "use warnings" to a program that you are have problems with. They will point out many things to fix in your code.

You use the CGI module and create a CGI object ($q) but then you don't do any more with the object (other than printing the header). Instead you use a very nasty (and potentially buggy) CGI parameter parser.

Fixing these issues will make it easier to track down the real problems with your code.