Chosen Solution
No accidend is happend. My Ipad 3 screen shows just Grey or colored stripes on the screen. I cannot work with y i pad. I used restore and itunes to set my ipad as a new one. But nothing is helping.
Grey and colored lines all mean that the screen is physically damaged. Another cause can be physical damage to the LCD connector on the board (such as liquid or pry damage from prior repair attempt). If the iPad has not been subject to a prior repair or to liquid damage, then you probably damaged the LCD and it needs to be replaced. This guide will show you how to replace the screen and also has a link for the needed parts and tools.