Well looks like mine has gone fault already after only using a handful of times!
Turned PC on tonight, turned headset on. Got a popup saying the device had malfunctioned. Couldn't receive sound. The charging port light is solid red and the blue light is constantly on too.
Nothing happens when I press the power buttons, only way to stop the blue light is by removing the wireless dongle from the PC. But the red charging port light remains on and the headset is unresponsive.
They're fully charged too and were connected via usb cable when I initially turned them on.
This is the only issue I've had with mine too. So... google for a guide to "unplug corsair vengeance headset battery". It's basically, take off the correct ears padded cup (I forget which or I'd say).
You carefully peel off the (yellow in this case I think) pad underneath. It's sticky but... not like CRAZY sticky. That gives access to some screws, undo those and you'll see the small battery with cable. Unplug, make a coffee, replug and it'll be working fine.
Had it happen once to the missus' blue 2100 set. It's a MINOR grumble with it and can happen but only occurred once for me.
Couple of youtube vids of it.
here +
here.
It's totally non damaging/etc.