We made a copy of the server image and moved it to another server (the server name changed too). I have access to Central administration, i have access to SQL server, but not to the Sharepoint main page. I get there the access denied page.
I've never tried it in 2013. But in previous versions of SharePoint I know you can't just change the machine name on it.
Well you can do it. But it's not as straightforward as just changing the machine name.
Here's a blog I found which lists the steps required http://www.bluesphereinc.com/blog/renaming-a-sharepoint-20102013-server/