How do I determined if the USB ports are working?

How can I determine if the USB ports are working.  Macbook Pro i7.
Thanks for any help.  This is a new computer to me migrating from a PC system.

Blessings to those who are able to reply with possible answers.   I am sorry....but I have spent days working on getting my two USB ports to work also.  I basically use the USB ports for a wireless mouse and various flashdrives/memory sticks.  I have a MacBook Pro 2011 Snow Leopard 10.6.8  I have tried software update, SMC and PRAM resets, battery reset, hardware test, creating a new user account....and browsing and reading numerous discussion boards.....awgh!  I have stopped short of using my install DVD (fear of loosing data), upgrading to Lion or Mountain Lion (some fear of loosing an application that might not be compatible), contacting an Apple Store (AppleCare or whatever--live 2 hours away + fear of expense), and of course, trashing the laptop.  Does anyone out there have any possible solutions?   I see I am not alone.  --A frustrated first-time Apple products owner.

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