Fix bluetooth mouse connection problem for a Apple Snow Leopard laptop

Bluetooth Setup  "Pairing Attempt Was Unsuccessful" for a wireless mouse to a Snow Leopard laptop. 

$ cd /Library/Preferences

Remove the old Bluetooth list.  
$ sudo mv com.apple.Bluetooth.plist com.apple.Bluetooth.plist.2013Jan11
Now, it shows "No mouse found"

Shutdown and restart

Wonderful, the Bluetooth mouse now works even at log-in. 


2015 Jan 13. After update this laptop to Yosemite, the bluetooth mouse connection problem re-ocurred. I tried the same procedure. However, bluetooth mouse was still not connect at the start. It seems that bluetooth mouse does not even show up on the ddetected devices.