IMac powers up fine.  Wireless keyboard and tracking pad not recognized. Power lights blink twice, repeatedly. Any ideas?

My iMac was off during a recent thunderstorm. When I power up the computer all is fine.  However the wireless keyboard and track pad are not recognized by the computer.  Their power lights blink twice, go off, then blink again. Any suggestions?

Turned out that I had to disconnct the keyboard from the new iMac in order to show in the old iMac.

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    USB and FireWire Quick Assist - Apple Support
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