Apple iMac (21.5 and 27-inch, Late 2009) - Manual (Page 13)

Chapter 1 Ready, Set Up, Go 13
Step 4: Press the power (® ) button on the back to turn on your iMac.
You hear a tone when you turn on your iMac. Click your mouse to connect it with
your iMac.
Important: If your keyboard and mouse aren’t paired, follow the onscreen instructions
to pair them with your iMac. You may have to click the mouse once to establish a
connection. For more information about pairing, see page 28.
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