[V71 FAN LED Switch Not Working]

Hello everyone,

 

i have one question, hoping that you can help me. 

 

I bought V71 case 2 months ago. Everything worked just fine. Today, fan led button "stopped working". When i turn on pc, all FAN leds are working. Then i hit the fan led button, and all leds shut down. Howewer, i can't reignite them with fan led button. Only way to get them back on is restarting the pc. When i press fan led button to turn them back on, all led lights lit for a second.

 

What should i check? I removed top, and everything seems just fine.