I was asked recently to look at a broadband connection that was acting up. All the lights on the modem were lighting up, and there was no connection to the Internet. It had been working perfectly well for several months, and there had been no changes to either computer, or modem configurations.
The computer owner had been on to his providers technical support, and they had sent him a new modem, but he still couldn’t get it to work. I called out to have a look last week. After putting in the username, password and connection settings, the modem still wouldn’t connect to the Internet. I disconnected all the phones in the house, and it worked. By plugging in the phones one by one, I was able to narrow it down to one particular phone. Turned out the problem was with the micro-filter attached to the phone. A quick swap sorted out the problem.