i recently purchased a pair of dre beats bluetooth headphones and am attempting to connect them to my pc. I have already connected them to my phone and it works properly. When i tried to install them on my pc (windows 7) the device was connected and my headphones show up as connected in the audio playback box, yet no sound is coming out of the headphones, even as the green bar is fluctuating like it usually does to show audio playback. I've already set the headphones as the default device, and i have rebooted my pc to no avail. Any suggestions?