User is "myname@(none)"

[Hal Vaughan <hal@thresholddigital.com>]

I had to do some minor reconfiguring on my LAN (basically just changing 
the UPS), but it including having to juggle a few systems around and 
reconnect cables.  Everything is set up as it should be, but now, when 
I bring up, the host is "(none)" and when I log in, my prompt that 
would normally be "myname@workstation" is now "myname@(none)".  I 
haven't changed any config settings, but /etc/hostname is now an empty 
file.

What could have changed this just through shutting down and rebooting?  
I've never heard of this problem or anything else like it before.  I 
can go through and change my settings to restore the host name, but I 
don't want this to happen again.

Any suggestions what could have caused this?

Thanks!

Hal