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Try either plugging your receiver into a different USB port or reconnecting it to the keyboard.
NOTE:For instructions on how to reconnect, see answer 25852.
Once the K750 keyboard for Mac is properly connected and being detected, it will display in the
Solar App, as shown below.
Resolving Expose and Mission Control issues with the K750 keyboard for Mac
 Mac OS X 10.6 and earlier
 Mac OS X 10.7 (Lion)