Official comment
That typically occurs when the controller isn't receiving adequate power over the USB. Please try using a different USB port on your computer, a different USB cable, a powered USB hub, or even a different computer.
Please help me my Pioneer DDJ-RB usually work very good but today i saw what when i connected USB Cable controller looks like strange. FX buttons shine blue light and Master Cue button is flashing! Other buttons doesn't work and no audio and midi signal coming! My laptop and tractor recognized him but no sound no midi signal and doesn't in any reaction!
That typically occurs when the controller isn't receiving adequate power over the USB. Please try using a different USB port on your computer, a different USB cable, a powered USB hub, or even a different computer.
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I've already tried another cable and another laptop - nothing! The same!
Please try updating the firmware - see if the device is recognized and will update.