Isolation Test
Unpack your ADSL modem and all of it's accessories.
Place them next to each other on the floor or on a table. So you can view all of your ADSL modem package contents.
Plug your 'line' cable (RJ11) into the back of your modem, and then plug the 'line' cable (RJ11) directly into your telephone socket.
Plug your ADSL modem's power supply into a power outlet, but do not turn the power on yet.
Do not have anything else plugged into any other phone outlet in your premises at all.
This means to physically unplug any other device currently plugged into any telephone socket on the same number as your ADSL service.
This also includes digital foxtel, back to base alarm systems and facsimile machines.
Do not use any phone double adaptors of phone extension leads at all.
Plug your Ethernet (RJ45) cabling into the back on the modem, and then into the back of your computer.
Turn the power to your modem on, from the power outlet.
Turn your modem ON.