The LEDs seen on your SoundBox represent different modes for the SoundBox:
Green: Your SoundBox is turned ON
Red: SoundBox has been turned OFF
Blinking Blue: the SoundBox is in Bluetooth pairing mode
Green + Blue: SoundBox is connected to a device using Bluetooth (the TV screen on)
Red + Blue: SoundBox is connected to a device using Bluetooth (the TV screen is off)
Green + Orange: SoundBox is connected to a device using an 'AUX' cable (the TV screen on)
Red + Orange: SoundBox is connected to a device using an 'AUX' cable (the TV screen is off)
Yellow: SoundBox is playing sound from another device connected through HDMI to the TV (HDMI ARC mode)
Green/Orange: there is a software upgrade in progress on the SoundBox
No LED: Device in deep sleep mode