Wireless keyboard connected but does not work.

My wireless numeric keypad is connected to the iMac, but does not work.  Wireless keyboard and mouse are OK.  Tried connecting/disconnecting and restarting the Mac to no avail.  Everything was fine yesterday.  Any suggestions?

Try a SMC reset (could help, cannot hurt):
Intel-based Macs: Resetting the System Management Controller (SMC)
Barry

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