I assume that what you mean by "not visible" is that the index.php webpage is not displayed when you
enter the domain name. When this happens to me its for one of two reasons. The index.php
web page has an error in it or your computers security software refuses to display the index.php
webpage for security reasons. You can test for the first reason by using a simple "Hello World"
index.php webpage. For the second reason, google the domain name or link to it from one of your established websites.