hi all, i recently lost sound in my left headphone speaker which had the jack plugs, so i invested in a logitech usb headset and i still have the same problem ? i have plugged in a set of speakers i had kicking around that use the green jack plug and they are both working ?? yet either the usb or jack plug type headsets only play in the right headphone, ive tried uninstalling and reinstalling all the correct audio drivers etc and still having trouble, im running windows 7 64bit, anyone have any ideas what the problem can be ?? its sending me crazy,