USB Keyboard Not Working At Login Screen

After waking my brand new Mac Pro (OS X 10.7.4) from sleep, my usb keyboard sometimes becomes unresponsive. So, at the login, I am unable to type my password in order to restore my session.
Is there a reason for usb devices to not work after waking the mac up? I tried all of the usb ports on the mac, as well as all the ports on both monitors. Thankfully, I have a bluetooth mouse and that works. But no idea why the usb devices stop working all together...
My software is completely up to date. And since this computer is less than a month out of the box, I'm puzzled as to why there would be any issues with it. Please let me know if there is a setting that affects this and what I need to do to fix it.
Thanks!

Maybe it needs to be plugged into the Mac before it goes to sleep...
Because when it wasn't letting me type anything I tried every USB port on the Mac itself, as well as the monitors, and even using an extender. Nothing worked.
However, I did eventually leave the keyboard plugged into the Mac and it woke up without a problem this morning. So, I'm hoping your solution did the trick!
Thanks

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