Is the RealTek hardwired to the router? If the router has more than one Ethernet port, have you tried a different one?
I guess it's possible either the onboard NIC or the router failed. Can another PC connect to the router via this same Ethernet cable and then connect to the internet?
If the router is working with another PC, your options might be setting the XPS 8700 up on a WiFi network, assuming you have an add-in internal WiFi card, or maybe getting a USB>Ethernet dongle which plugs into to a USB port on the PC and to the Ethernet cable to the router.
Forum Member since 2004
I am not a Dell employee