I have an Ubuntu 12.04.2 machine set up that I'm using as a server for my house. Occasionally, it will become unresponsive and I am forced to reboot. When it does so, only the background shows up, nothing else of the GNOME desktop. When I Ctrl+Alt+F# to another console, after I put my username in, it sits there, doing nothing, not asking for a password. The same thing happens if I try to FTP or SSH in.
Can you help me figure this out? I don't even know where to begin, as I am not experienced in troubleshooting this sort of issue.