Sony VGC-RT2SRY User Manual page 196

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Troubleshooting
What should I do if my computer does not recognize my keyboard?
❑ Make sure the power switch on the back of the wireless keyboard is in the ON position.
❑ Make sure the supplied AA batteries are properly installed.
❑ Press the CONNECT button on your computer and then on the wireless keyboard to re-establish the connection between
the two devices.
❑ The supplied AA batteries may have run out of power. Replace the batteries.