Problem: :hammer: User unable to access mail,suspect faulty network card.

Setup:60users,2x48port Nortel Switches and 1xNortel router.

Resolutions and procedures:Disabled original netwok card in Windows,replaced network card and configure IP,DNS,WINS and Gateway settings,still unable to ping gateway.User is able to see other machines(not all of them) on LAN but not on WAN.User from other sites can Ping my gateway and get a reply but i can't ping it .Checked network cable OK,used crossover still no reply. I was now convinced that there is nothing wrong with the PC,network cable and wallbox.The problem should be in the server room.