I hope it works and that you needn't completely re-install.
If pointing your browser to http://localhost:631 does not work, then I suggest two things: Firstly, in a console, type in ifconfig and make sure that lo is represented there. If it isn't, configure /etc/network/interfaces by adding these lines:
# The loopback network interface
auto lo
iface lo inet loopback
Then, simply either restart your network (/etc/network restart I think)
and if that doesn't work, restart your computer. CUPS should then be
working. If not, then I have probably wasted your time.
Good Skill.
--
—A watched bread-crumb never boils.
—My hover-craft is full of eels.
—[...]and that's the he and the she of it.