I have a machine which was setup for me to do web development and testing on. The only access that was setup was SSH and FTP. I do not have a screen or keyboard connected to the box, I simply plug it into my network and access from there. This worked very well but then it was switched off and unplugged for a week and when I plugged it back in it just will not show up on the network. I have tried rebooting everything and have waited out the DNS address renewal periods... but still cannot access it. Any ideas what has gone wrong and how to fix it?