Binatone ADSL 500. If the synchonization is related to BT only, does it mean that even the service of PlusNet is unavailable, I should be able to see the icon on Windows tray bar is green and the line light on the modem is solid on?
I had the same problem.
It turned that the USB modem was drawing too much power.
I had to disconnect my other USB devices before it would work properly(and I have a 400 watt power supply on my pc).