Hi, your problem just like another problem on ifixit, but the guy is using iPhone. You need to get your iPad repaired first. If the iPad cannot be turned on, no apps can help you to recover your data like your photos, videos, etc. Just have a look on this question, it may help you, good luck. http://www.ifixit.com/Answers/View/169666/Photos+disappeared+when+battery+replaced.+Can+they+be+retrieved