The system is forced to go to sleep, locked via 'Win + L' or any other combination to lock the system or force it to turn off the display.Synapse is running in the background at the time of system timeout.The system goes to sleep after a timeout.You may configure the lighting of your keyboard's LEDs through Synapse 3, however, note that the 'Switch off lighting when the display is turned OFF' setting will only work if: The LEDs will turn off if the USB ports are configured to shut down when the system is locked. Note: Without Synapse 2.0 or 3, the LEDs on the keyboard will revert back to their default lighting effect (usually Wave or Spectrum Cycling) when the system is in standby or sleep mode.