My daughter took her iPad to school and brought it home red and fuzzy. I know not good. When you turned it on the screen was red with a white apple like this:
Then when you got to the home screen it was fuzzy or "noisy" with pixels floating. Plus it had a red tint like this:
Searched the internet and found out you just tap it on the back! So I took it out of the case, turned it over and tapped it with my palm four times around the center. Turned it over and voila! Fixed! My daughter almost lost it. What a quick and easy save. Love the internet. Hope this helps!