The power light tells you whether the modem is receiving power. When your modem is working properly, the power light is solid green.
Problem: Not lit up
If the power light isn't lit up, then the modem is not receiving power.
What you can do
- Wall outlet problem. It could be the wall outlet isn't getting any power. Try plugging something that you know works (e.g., a lamp) into the outlet you are using for your modem. If the lamp (or whatever you use) doesn't work, then the outlet isn't getting power.
- Modem problem. If your modem has a power switch, then switch it to the ON position. If your modem doesn't have a power switch, "power cycle" it. To do this, unplug your modem and wait 30 seconds. Reconnect the power to your modem, and wait for it to boot up/restart.
- Power cord problem. Double check the power cord at both the wall outlet and at the modem. Sometimes the cord can wiggle loose at either end. You should also check the the power cord for obvious damage, looking for nicks, cuts and crimps. Finally, be sure you're using the correct modem cord. (Sometimes people use old cords or cords for other devices.)
How to replace the power cord
Although it's rare, the power cord might be bad. You can replace the power cord, but be sure to swap it for a cord that has the proper voltage and amperage. Using a power cord with the wrong voltage can damage your modem and/or cause an unstable connection.
To find your modem's power requirements, flip your device over and look for a sticker with lots of tiny type. You're looking for "Power Rating" information.
Problem: Amber light
An amber (yellowish-orange) light indicates the modem is booting up or going through a firmware upgrade.
Problem: Flashing light
If the power light won't stay solid, the modem could be stuck in the reboot cycle.
If your modem is plugged into a surge protector or UPS system, unplug it, and plug it directly into the wall outlet. If the light keeps flashing, unplug the power cord for at least 30 seconds, and then plug it back in.
Problem: Red light
A red light means the modem is rebooting. However, if it continues to be red for more than a couple minutes, it could indicate hardware failure.
If your modem is plugged into a surge protector or UPS system, unplug it and connect it directly to the wall outlet. Even if you're not using a surge protector, you can "power cycle" the modem by unplugging it, waiting 30 seconds and reconnecting. In a few moments, the modem should reboot and come back online.
If the light is still red, contact CenturyLink tech support for help.