No ouput when using Navigator

I have a script using PHP4 that works fine with IE5. The script queries a MySQL table and returns results. When I use Netscape 4.08 I get no output whatsoever from 'within' the php script or after it. Output prior to commencement of the script is fine. When I view the source, the code appears all correct as expected and suggests that it should display. Have seen an FAQ on a similar issue but that was when the source was empty and PHP had stopped output. In mine, php seems to output ok but netscape just doesnt want to display. Only being new to php I was feeling pretty good about my first effort.... until I tried it in Netscape that is. Any help would be greatly appreciated. John