I have a problem today every time i connect a usb mouse on the macbook pro turns off.

I have a problem today every time i connect a usb mouse on the macbook pro the laptop turns off. What could i do to fix it?

Execute SMC and PRAM resets:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
If no success, try another mouse.  It may be faulty.
Ciao.

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