Mighty mouse acting up (now there's a surprise...) Please help.

I've had this USB mouse since March 07 - so I know all about the problems, how to clean the track ball etc - and on the whole it's been okay so long as I serviced it regularly. But now it's acting up in a different way.
Today the primary (left) button wouldn't work and had instead 'become' the secondary button. So I checked the settings in System Prefs and they were all okay. I cleaned the mouse. No difference. I reset the permissions (read somewhere that is can have an effect). Still nothing. Turned off the Mac. Unplugged everything. Fired it all up again. Same problem. Fiddled around with System Prefs again and found that if I turn off the trackball button, set left button to primary and right button to secondary, I get the primary button function back again (but secondary button does not work). I can get secondary button function by Ctrl+click (like the old days).
Any ideas before I shell out 35 quid for a new one? BTW, I plugged in a seven year old Dell USB mouse and it works perfectly.
PS. Mighty Mouse is stylish and neat but has never been trouble free like most other makes. Such a shame.

Not so Mighty huh? Back to the drawing board. Perhaps someone else can help.
Carolyn

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