First, I'm assuming that you are talking about an iPad? Maybe some more information may help, i.e. which model, new vs. old, any recent damage, like a drop?
Second, just for a try - do a 'Reset' - Directions HERE and see what happens?
Finally, if the battery may be 'exhausted' a prolonged charge might help - but please provide some more info, do a 'reset', and post back here the results - good luck!
Yes as Giradman has said we do need more info on your problem to help you better.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.