Unhappy [Q]

Hello one & all,
I hope someone out their can help me, I am using a Nexus 7 the 2012 version and am having fun trying to get my bluetooth mouse working with it again. I inanvertantly changed the setting in the paired device section so that a bluetooth mouse is not seen as an input device and my the mouse is listed within the available devices section but I can not pair the device. I know that the bluetooth mouse still works as I have tried it on other hardware.

My Nexus 7 is not yet rooted and I am not sure it rooting it would reset the correct bit of the system to once again alow me to your the bluetooth mouse.

Thank you for any help you can give.