IPad not switching on?!

I have and iPad 3 32GB with the latest iOS update. I few days later i put the iPad on charge, next morning it wasnt switching on. When i press the power button, it shows the apple logo for about a minute, after that, nothing, blackout again. When i repeat it, same happens. I tried holding the home button and the power button both at the same time for 10 seconds. At the 3rd or 4th second i see the apple logo and by the 7th second a flash goes off on the screen, meaning a completely bright while light shows up for a fraction of a second. After that same, blackout. I dont want to loose the data in the iPad as it has a lot of pictures/videos that are necessary. What should i do!

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