Try pressing the connect button on the bottom of the mouse and then pressing the connect button on the receiver. If there are lights at all on the mouse, and they don't work; then the mouse is shot. If there are lights, but it won't connect; try guarenteed new batteries (make sure they work with another device). If this doesn't work aswell, then the mouse is more then likely shot. Try warrenty service after these steps and it doesn't work.
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Logitech wireless mice operate in a slightly different
technological sphere to wired mice.
Wireless mice need batteries, they need to be turned on and
they need an interference-free radio environment.
One advantage of wireless mice is that they tend to function
with laser or optical parts rather than a ball and wheels, so there are fewer
moving parts to go wrong.
However, optical and laser wireless mice have considerations
to take into account.
Change the batteries in the mouse if the mouse doesn't work.
Remove the battery cover and insert new batteries.
On the underside of the mouse could be plastic sticker with
a phillips head screw (star) under it
Turn the Logitech wireless mouse on with the switch on the
Plug the USB receiver into a USB jack on the computer.
Try to use a free jack that's actually on the computer
rather than one that's in a hub.
Test the jack first.
Try plugging in a printer and see if the printer is
recognized--that way you know the USB jack is good.
USB jacks are notorious in that you frequently get a bad
jack on a computer.
Turn off devices that are in the same frequency range as
Logitech wireless mice operate at 2.4 GHz, which is in the
same area as Wi-Fi routers and older cordless phones.
Start by turning those devices off and see if you can
eliminate any causes of interference.
Test with wireless speakers too, then computer power
supplies, monitors, cellular telephones and garage door openers.
Place the mouse on a flat surface that doesn't reflect.
Avoid metal surfaces too.
You need new AA standard type of battery. Use alkaline battery (longest life). Don't use cheap battery because solution from battery can go out and destroy your mouse. Battery life from that mouse can be around 6 month with good battery. This is very good duration for this type of mouse.
I think you said you changed the batteries. if so try the following.
Turn the mouse over and find the small
rest/connect button on the bottom of the mouse and press it.
This should connect the mouse to the receiver and work properly.
If not, try pressing the receiver button and then press the button on
the mouse. This should be done whenever you change batteries or
Hope this helps you. Bud