Do other computers work on your router? Netbook on that same router? If so - then the motherboard PCI bus may damaged - try several PCI slots ...
Yes, the netbook I’m using now functions OK with same DSL modem.
When I connect the desktop with the new ethernet card installed, the Ethernet lights OK. Previously, the motherboard PCI Ethernet light was dead so the DSL modem is seeing the new PCI Ethernet card.
I’ll try installing on another PCI (only have 2 and 1 is being used)
How do I determine if motherboard is damaged? (All other functions of PC is OK)
Thanks for your comments!