My control box has had a constant blue light for years when powered on. The box has no power button but uses the remote to power on and off. When the light changed color the power button (only) stoped working. Only way to power on/off now is to unplug unit. The tv works ok and I can cut the tv off with its remote but the control box remains on all the time.
Are you referring to your TV cable box? If so, you have posted to the wrong forum; either X1 or non-X1 service.