N750 Wireless Dual Band Gigabit Router WNDR4000 User Manual
• The 2.4 GHz
•The Internet LED is on. If it is not, make sure that the Ethernet cable is securely attached to the wireless router Internet port and the modem, and that the modem is powered on.
Verify that the LAN LEDs (1 through 4) are lit for any computers cabled to the wireless router by an Ethernet cable.