New USB not working in new macbook pro. What do I do?

I have just bought a brand new 16 GB USB stick for use with my 2 month old macbook pro. My mac is not recognising the presence of USB stick but I have checked and the USB works in the other family laptop which is a Toshiba. I have used other USB's with the mac so I know it is not just as simple as the ports are not working. Help!

For reasons unknown to me, your MBP does not like that USB device.  I assume you have tried all available USB ports.
Ciao.

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