Table 3. Troubleshooting with LEDs
LED Behavior
All LEDs are off when the cable modem is plugged in.
All LEDs stay on.
The Ethernet LED is off for a port with an Ethernet
connection.
The Internet LED is off and the cable modem is
connected to the cable wall jack.
The Power LED lights red.
Troubleshooting
Nighthawk Multi-Gig Speed Cable Modem
26
Action
• Make sure that the power adapter is securely
connected to your cable modem and a functioning
power outlet.
• Check that you are using the 12 VDC, 1.5 A power
adapter from NETGEAR for this product.
• If the error persists, a hardware problem occurred.
Contact technical support.
• Reset the configuration of the cable modem to its
factory defaults.
• If the error persists, a hardware problem occurred.
Contact technical support
• Make sure that the Ethernet cable connections are
secure at the cable modem and at the computer,
router, or WiFi router.
• Make sure that power is turned on to the connected
hub or computer.
• Be sure that you are using the correct cable.
• Make sure that the coaxial cable connections are
secure at the cable modem and at the wall jack.
• Make sure that your Internet service provider
provisioned your cable Internet service. Your ISP can
verify that the signal quality is good enough for cable
modem service.
• Remove any excessive splitters that you installed on
your cable line. Run a "home run" back to the point
where the cable enters your home.
The cable modem is too warm and might overheat. Do
the following:
1. Disconnect the power adapter.
2. Wait a couple of minutes to let the cable modem cool
down.
3. Make sure that the cable modem is placed in a vertical
position.
4. Make sure that the cable modem is placed in a
location with good ventilation.
5. Reconnect the power adapter.
User Manual