Computer won't connect to internet
I'm having some problems with a residential computer that is running Ubuntu 9.10
It has worked fine for years. Client moved to a new home and has Comcast cable internet.
A couple of Comcast techs got him up and running after some head scratching.
It worked fine for a couple weeks but now he can't connect to the internet.
I've tried turning the power and and off on the modem.
I've checked the cable connection between the modem and the computer.
I'm connected through an ethernet cable.
The computer says that a successful network connection is established but no browsers will work.
I've tried Firefox and Opera. Also I get an error when I attempt to download updates.
Any ideas for where I should start troubleshooting this problem?