My logitech cordless Wave Keyboard and Mouse have suddenly stopped working. The green light is on the mouse and keyboard so Im not sure why it will not connect.

Hi,

There are several different methods in resolving this issue. Before you perform these methods, make sure that the battery of your cordless mouse is fresh. Then, try this first method..
Method 1: Resynchronize your device with the receiver loadTOCNode(2, 'moreinformation'); To resynchronize the mouse or the keyboard with the receiver, follow these steps.
Note When you synchronize the mouse or the keyboard with the receiver, put the device near the receiver and put any other wireless keyboards and mouse at least 6 feet away.

1. Press the button on the receiver, and then verify that the light on the receiver starts to blink.
   
   Note Some newer Microsoft devices are permanently bound to their receiver and cannot be reset. If your device does not have a button, skip to Method 2.
2. If a dialog box appears on the screen in several seconds, follow the instructions that appear on the screen. Otherwise, go to the next step.
3. Press and release the Connect Channel button on the bottom of the mouse or the keyboard.
4. Check the green light on the receiver. A steady green light means the synchronization was successful. If the problem persists, try steps 1 through 4 again.
5. For the Wireless Notebook mouse: This issue can occur if the micro-switch on the bottom of the mouse is not released. Use a pin or a pen to try to release the button if it is depressed.

Make sure you have the correct keyboard and mouse selected
you might have to uninstall your keyboard and mouse then restart your computer and reinstall them make sure that you have there drivers backed up on a disk before uninstalling them
click start control panel,keyboard select hardware you will see which keyboard it is this will also apply to your mouse
also select properties,general to troubleshoot,driver roll back uninstall ,update driver
or click start control panel administrive tools computer managent device manager scroll to keyboard you could see a yellow question mark? right click to install drivers

hope this helps