How To Take A Screenshot On Your iPhone
Simple thing which i didnt even know you could do until long ago
When your on the screen you want to take a screen shot of simply press and hold home and then press the sleep/wake button. You have to be quite quick otherwise it will take you to your home screen. Your taken pictures can be found in your camera roll!
How bout when your power button is broke?
Sorry there is no way that I know of when your power button is faulty