WTF?????

Interesting problem with a Compaq and DSL. Had a customer buy a Compaq computer then signed up for DSL. Everyting went well for them until about two weeks ago when DSL quit on them. The ISP/phone company checked everything no detected problems 'cept when they tried to connect it would try but stop and say server not found. I went out and checked the computer and replaced the network card with a 3-Com nic with the same results so I brought the computer into our shop, hooked it up on our DSL network and it worked perfectly. We are using a LinkSys router which handles the IP addressing at the shop, but at his house it's a server assigned IP so with the IP address, gateway, DNS, etc installed it doesn't connect??...anyway I work pretty closely with the ISP and we've changed modems, network card, cables, splitter all with same results. It will send data fine but recieves data in a trickle. The ISP has also checked their ports and they test good. The system is a Compaq, 3-Com nic, Alcatel DSL modem, and Windows XP home and, interestingly enough, the link lighht on the nic shows a green light but the computer shows it only to be conneted at 10mbps at both places. Anyone have any other ideas????? :eek: :confused: :eek: