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Look for the power button and press it to start the camera.
If you press both the Power button and Home button simultaneously a screenshot of your current screen will be saved to your "Camera Roll". If you hold both the Power Button and Home Button your iDevice will shut down and reboot.
Double A Batteries.
You have to press the power on/off button and the camera button at the exact same time.
Try resetting your iPhone. Hold Down the Home Button AND the Power button at the same time for 30 seconds
You can record screen shots by pressing the Home button and Power button at the same time.
Hold down the Home button and then press the Power button. You will see the screen flash and hear the camera shutter sound. The picture will be stored in your Photos app in your Camera Roll set.
Try resetting your iPhone. Hold Down the Home Button AND the Power button at the same time for 30 seconds
What version? Well, it doesn't matter. Push the power button.
Press the "power off" button on your computer. This button apparently has access to all of the multiverse of power, and will work, unless your computer is VERY screwed up.
the power switch on a camera turns on or off the camera.
Open Control panel, double-click Power Options