Dee Bee, can you try the following ? :
1. Suspend the PC or laptop
2. Start the PC or laptop
3. Try if you can key in anything

I have a HP Pavilion g4 laptop that I bought last year.
I've been installing few Linux distributions and had the same issue.

In the beginning I was using Ubuntu 12.04 and had no problem.
After I upgraded it to Ubuntu 13.04, I had the same issue as reported in this 
thread.
After  googling a little, and tried some solutions provided in other threads,
nothing worked.
So I decided to suspend the PC and wake the PC up again, and I found out that I 
was able to 
use my keyboard.

I am not sure if it will work on your case, but please give it a try.

I also noticed that when I boot and reboot a couple of times, once in a while, 
I am able to 
use my keyboard... Very funny...

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https://bugs.launchpad.net/bugs/1172852

Title:
  USB keyboard and mouse don't work

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