Keyboard has stopped working on my pc

I have just replaced my pc power supply as the old one was making too much noise due to dust build up. I have plugged everything back in the normal places but somehow my keyboard and mouse are not working so I cannot log in to windows as I have a password... What might be the problem?
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More about keyboard stopped working
  1. where are they connected to? PS/2 port or a USB port? try connecting to either and see if it works.
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