nVidia LED Visualizer doesn't work :\

[Tomek20225]

Hi
I've bought my PC around month ago. It contains i5-4690, Gigabyte GTX 970 G1 Gaming, 12GB RAM, ASRock Z97 Extreme3 etc. My case has a side window, but since i have a PC on my left I can't see it + it's under my desk. When my friends came to me and I wanted to show off my new rig in it's full glory I saw that the LED Windforce logo wan't shining. I got into GeForce Experience and chcecked that. nVidia LED Visualizer was off, so I turned it on with some effects and close the program, but the LEDs stlii didn't work. Got into Visualizer again and saw that it turned off! Now, when I tried to fix this few times it still doesn't work.
Can you help me somehow?

I'm sorry if I made mistakes - I'm Polish.