Every iMac computer has Energy Saver settings which conserve energy usage when the computer is not in use. One of the most common Energy Saver options is sleep mode -- a setting which shuts down the monitor but keeps all running programs open. When the computer is ready to be used again, it only takes a few short moments to wake up. The wake up process is generally straightforward, but certain hardware may cause minor problems.
Move the mouse to wake up the iMac from sleep mode. If the mouse has a Bluetooth connection, however, it may lose the connection to the computer in sleep mode, depending on the power settings.
Press any key on the keyboard if the mouse does not wake up the computer. Again, if the keyboard has a Bluetooth connection, it may not be able to wake up the computer from safe mode.
Perform a hard reset on the iMac if the mouse and keyboard do not wake it up. Press and hold the power button on the back of the computer until it powers down. Press the power button again to turn the computer back on.
Tips & Warnings
- If you have a Bluetooth mouse and keyboard, open the Apple menu and select "System Preferences." Open the "View" menu and choose "Bluetooth." Make sure the box next to "Allow Bluetooth devices to wake this computer" is checked. The Bluetooth keyboard cannot wake up the computer if the box is not checked.
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