Broadband yellow light

Hello. I'm having issues with a broadband light on my 1701hg 2wire router coming on. If I reboot, it will work for awhile, then it comes back. I tried another ethernet cable, checked the connection to the wall socket (looked good, but I don't have a tester) and also make sure that my marvel yukon (local area connection) settings under properites, configure, power settings does not have the box checked to allow the computer to turn off the system for power savings. Any ideas? I'm using At&t for a service provider. The only thing that I haven't been able to check is the 2wire router itself.