Logitech Wireless Keyboard not resetting evidently...

Question

Just put new batteries in both wireless mouse and wireless keyboard. These do not have reset buttons on the bottom as do newer products like this. The Logitech Receiver is the only part that has a connect button. Finally, the mouse is working, but the keyboard does not allow me to type characters. When I try to type, nothing appears on the monitor. What is the key to resetting after putting in new batteries and having no reset button?