I can't take screenshots on Galaxy S3 mini I've had the Galaxy S3 Mini for about two weeks and I can't take screenshots anymore. I hold down the home and power button but it just takes me to the task manager window. I also can't seem to be able to turn off or reset my phone.
I would recommend trying the other way to make a screenshot on the SGS3. Simply swipe with your palm from left to right over the screen. If that does not work, ensure that the gesture is enabled in your device's settings menu.