I am trying to fix Internet connection on a friends Dell inspiron 1720 with XP service pack 3.

It has an integrated network card that stopped working, after powering down/up the modem still didnt work I brought it back to my place to try a few things ie check cable, update driver etc... still didnt work.

So I bought a USB LAN connector. It didnt work straight away but I went to configure the properties and changed the ConnectionType from AutoSense to 100 BaseT 10BaseT Full_Duplex, I basically just tried them all.

From my place when connected to my desktop - 10 BaseT and 10BaseT Full_Duplex worked. From my place When connected to their laptop - 10 BaseT and 10BaseT Full_Duplex worked.

Happy I went back to my friends house confident it would all work, and it didnt.

Brought it back to mine and it did.

While there, in Network Connections the connection is there recognized, enabled, 'working properly' it just says not connected. Also there is no led on the USB connector

While at mine as above except there is an led on the USB connector and it says connected.

Other difference I can think of is they have a cable modem, I'm plugged into the back of a Belkin wireless router - would this make a difference?

Any other ideas what to try?

(Would getting the model of the cable modem help anyone?)

The USB connector is "DM9601 USB to Fast Ethernet"