I have my headset since march, two weeks ago it stopped to turn on. 
It charges green blinking and after while stays green light but it won’t turn on when I press the button, and yes I already tried to charge for a long period and with different cables.

I found out that it's a commom problem with this headset, there is people complaining about this same problem on this forum.

Even with a 2-year warranty stamped on the box Razer refuses to provide a guarantee because I am in Brazil. Razer just told me to contact the seller, which I did, but they ignored the issue and stopped answered.

Now I have an expansive wireless headset that only works wired.