What's wrong with my screen and how do I fix it? My iphone 4 froze so I reset it. After it turned back on I found that the screen ( the backlight, i assume) was flickering a lot at the edges.

I went to settings and turned down all the brightness and the flickering disappeared but as soon as I turned it back up it started flickering again so I decided to reset my iphone again. After the iPhone (4) turned back on I tried pulling the brightness up again, now I can see faint vertical lines up and down the screen ( like a grid) and turning up the brightness still results in more flickering. Also, as I type this, the keyboard on my iphone is slow to recognize touch. Before it froze I had been watching a 2 hr documentary on YouTube. Did it freeze because I used the phone too much? And my iphone was on the settings app when it froze. How do I fix the flickering (and is it going to cause more damage?) and how can I make the iPhone more responsive (faster) to touch? Your help is appreciated. (Everybody hates a slow keyboard)

Try:
- iOS: Not responding or does not turn on
- If not successful and you can't fully turn the iPod fully off, let the battery fully drain. After charging for an least an hour try the above again.
- If still not successful that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.

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