How can I connect a bluetooth mouse without using the cursor (chicken and egg problem) My bluetooth mouse batteries died, and when I replaced them, the mouse didn't reconnect. Now how can I get OS X to discover and connect my mouse without having a mouse to open the mouse dialogue?
You can open the Mouse System Preferences by using Spotlight search. 


Press ⌘-Space to open Spotlight. Type "mouse" to find the Mouse System Preferences and press Enter.
When the Mouse Preferences are opened, make sure the mouse is on and wait for it to be discovered. The "Connect" button should be blue, so you can press Enter to connect to it, and you're done.