Dell Wireless Keyboard

Check the pins of the plug. One of them might bent.

Wireless/Bluetooth keyboards and mice can only be used with one device at a time it is like a bluetooth headset once it is paired with a phone it will 99.99% of the time only work with that phone and that phone only, Wireless keyboards and mice are setup on the same principal once they are paired up with 1 PC to use on another PC you have to remove the pairing. The worst case scenario is that the second PC's Wireless/Bluetooth has failed. I hope this helps.

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Look for a little wireless icon in purple on the keyboard in the F keys up top. Example F9.

You hold down the Fn on the bottom of your keyboard and at the same time press the (example F9) to enable wireless.

It varies by model and I don't know which F key it is on the c400. You should be able to tell.

Hello, two possible solutions spring to mind.
1) Get yourself a standard wired keyboard to plug directly into the ps2 purple socket (next to the green one, which is the mouse connector) just keep it for those 'special needs moments'.
2) If you are plugging your wireless keyboard receiver directly into a usb socket, then you should have an adaptor supplied with your keyboard receiver that enables you to plug the usb end of the keyboard cable into the ps2 keyboard socket of the computer (the purple one) . That way your wireless keyboard will be able to work at bios level.
Hope you find these suggestions useful!
nicam49

Your wireless receiver has two connection, right? A purple for the keyboard and a USB connecter. Don't plug in the purple keyboard jack. Only plug in the USB. You might have to restart your computer a couple of times to get this to work right.

replace the battery of keyboard.

reeinstall the drivers

You either have keyboard disable in bios. You should check bios when you boot the computer to see if the keyboard is disable.

check the device for a " reset " button, they are usually located on the bottom of the device, if this does not work, you may need to contact dell directly and discuss the problem further.