Logitech mouse won't work on my mac?!?! HELP!!

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May 8, 2014
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hello,
I bought a a logitech mouse - m235- but it wont work on my mac . The computer just doesn't detect the receiver in the usb port. I went to the store and they tested the mouse on windows and a mac- it worked just fine. I installed logitech's Connection utility but it doesn't detect the mouse. ( scanning for mouse- nothing found). I went to the mouse preferences on the pc itself but it doesn't detect a bluetooth mouse? What is going on?!?!?

Thanks for replying!