NETGEAR Nighthawk CM3000 User Manual page 24

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 CM3000 2.5 Gbps Cable Modem
24
Action
• Make sure that the power cord is properly connected
to your cable modem and that the power supply
adapter is properly connected to a functioning power
outlet.
• Check that you are using the 12 VDC, 1.5A 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.
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