Resetting PRAM without USB ports functional

Hello,
I've been searching for a solution to this but to no avail.
I had my 2008 Mac Pro unpugged for a few days. When I turned it back on the USB ports weren't functioning.  I can't reset the PRAM as my keyboard is not working.  Any ideas?
Thanks in advance.

reset the smc first and see if that helps.
also I would be suspect of any and all usb cables and devices for now until you get it straightened out.
and no other kb or mouse? I would pick up a $19-25 keyboard for spare testing or replacement.
This is what I use now normally - $8
http://www.amazon.com/gp/product/B004SUIMGW/

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