My ex100 logitech mouse isn't working properly

try replacing the key board battery or make sure that it is the correct way

you should try downloading the keyboard drivers from the below mentioned web-site...
http://drivers.softpedia.com/get/KEYBOARD-and-MOUSE/LOGITECH/Logitech-Cordless-Desktop-EX-100-241.shtml

Do a Hard Reset method to clear the keyboard and mouse settings and reconnect it back to your computer:

• Remove the batteries from the keyboard
• Press the Connect button on the receiver for 10 seconds.
• Press the Connect button on the mouse.
(You might need a pencil tip or other small tip to press the connect button.)
• Insert the batteries back into the keyboard.
• Press the Connect button on the receiver.
• Press the Connect button on the keyboard.
Hope this helps

Please rate this solution, thanks!

some do that check for a clean connection good contact ok;

Do a Hard Reset method to clear the keyboard and mouse settings and reconnect it back to your computer:

• Remove the batteries from the keyboard
• Press the Connect button on the receiver for 10 seconds.
• Press the Connect button on the mouse.
(You might need a pencil tip or other small tip to press the connect button.)
• Insert the batteries back into the keyboard.
• Press the Connect button on the receiver.
• Press the Connect button on the keyboard.

i just got off the phone with logitech tech support about my 'dead keyboard'. I have a logitech wireless keyboard/mouse ex100. the mouse still worked and the keyboard just quit all of the sudden like. THE FIX! 1. Make sure in your device manager that the keyboard is still connected and working properly. if it is...
2. then remove the batteries and type on the keyboard for 10 seconds or so.
3. Then reinsert the batteries.
4. press the left alt key, left control key, and the f12 key all at the same time.
5. Then press the connect button on the reciever
6. press the connect button on the keyboard
7. press the escape button on the keyoard
8. test the keyboard
it worked for me :) that's how i was able to type this. hope it works for you

replace the cells and check for the blootooth blinking

Never mind, I just went into system preferences and selected the speakers. They certainly do work!

ur keyboard & mouse must not be install properly

The assumption here is that the keyboard and mouse "have" been installed previously and are not working now. I know that "ass"ume is a four letter word but it had to be said. 1. Check the batteries and make sure that they're ok. If only one of them is weak, replace "BOTH" of them. 2. Re-synch the devices with the transmitter foillowing the instructions in the manual. 3. If you think that the drivers have been corrupted, go to "device manager" and update the drivers. 4. You should be able to download all of the data that was on the installation CD from the Logitech" site. Good luck.