As a newbie to geekzone I am looking for someone who knows what is happening or what I should o when I get the message "authentication failed" when I try to instal this SX-905D headset according to instructions. The pairing lights begin perfectly and the headset icon on the desktop changes to yellow but it "fails to authenticate" and the service and hardware are nonfunctional. The batteries are good and the dongle is activated as is the  5D wireless BT mouse (which was set up with the same instructions!
Is there a trick to activating this headset?
I'd be obliged!