Keyboard not responding (by 10 users)

my wireless keyboard stopped responding.  i replaced the batteries, even though, i had just replaced them days before to make sure that wasnt the problem.  i pushed the receiver button on the underside of the keyboard.  the light flashed on the receiver.  mouse is still working fine and is off same receiver.  i pushed the button on the receiver itself to recognize the keyboard also.  light blinked in response.  the hot keys all work, but not any of the numbers, letters, f keys, nothing.  in the control panel, nothing is listed for the keyboard, but the mouse is listed.  have restart computer several times.

i unplugged my computer to paint and when i reconnected everything my keyboard wont sync? the mouse works fine. i have tried to resync by removing batteries pressing on the connection button for a minute then pushing the connecting button on the receiver then putting the batteries back in the keyboard and pressing the connect button but nothing?? i have also changed the batteries????