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K70 going in to Demo mode when plugin in power, shows animated rainbow effect


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When i turned the power on the power supply, my K70 RGB just went in to some kind of demo mode (without turning on the computer). The interesting thing though is that the demo shows a rainbow effect across the keyboard, that Corsair says is impossible without CUE running. It cycles through 4 different static lighting modes and the rainbow effect in between them to show of the per key customization.


I took a video of the whole cycle:


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This happens when the USB port receives power but there is not USB enumeration (computer is off). The demo mode is hard-coded into the firmware and it indeed cannot be easily reproduced with CUE.


If you want to disable the demo mode from starting, go into your BIOS and check any USB settings related to power (ErP, EuP, etc).

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