Problem with magic mouse.

Hi all.... again.
I'm using the mouse with the iMac, but a few days ago I used it with the macbook air while watching a movie. That done, I took it back to the iMac and left it. I now find that it won't scroll up, down, or left and right. I've been through system pref's to the mouse which has 27% battery left but couldn't find anything to help. Anyone got any ideas ?

Are you sure the mouse is paired with the iMac? Turn off the power switch on the bottom of the mouse and then turn it back on. Make sure you see the connecting message on the screen.

Thanks for the reply. I thought I'd try it again today and it's working perfectly. I've done nothing, but I'm pleased it seems to have resolved itself. Fingers crossed.