Magic Mouse no longer pairing

I used a Magic Mouse successfully with my Mini for a month. I've given the computer to my wife, and it no longer wants to pair. When I turn it on, the green light comes on for a while, then goes off into a "two blink, silent, two blink, silent" routine.
The Bluetooth Setup Assistant says, "No mice have been found. Make sure your mouse is "discoverable"."
I have had it working with her computer, but often from sleep or reboot the pairing is broken.
I've also paired it with two other computers, which wasn't an issue initially. Do I need to make it unlearn something? What do the two blinks together mean? Any ideas what changed when I handed the computer over that could unpair the mouse? It is using a new monitor and keyboard, but that's the only significant change.
Thanks.

I'm having the same problem with my new 27" iMac. Maybe I'm a dunce, but Apple's (and many users'/posters') solutions to a non-responding/non-pairing mouse seem to be some variation of "Select X from the X menu" or "Turn on/off/open System Preferences/whatever. How do you select ANYTHING when you don't have a movable/clickable mouse cursor to select WITH? And yes, I've installed fresh batteries, clicked on and off, restarted, and still the mouse is NOT paired -- when I turn on the not-so-magic mouse, the green light blinks like crazy, but I get no screen message, no pairing, no nothing. Someone please wise me up to what I'm doing wrong.
Thanks!
Bart

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