This happened to me twice... I managed to solve the problem at first but when the problem persisted for the second time, the previous solution didn't work out... So, as I was googling for solution, I came across this blog kidzhouse.blogspot.com which provides the solution...
So, if this ever happens to you, what you can try is :-
Step 1 - Connect tab dgn charger....
Step 2 : Tekan on button & sentuh screen beberapa kali dalam 30 seconds...
Step 3 : Lepas button & battery charging icon will appear...
:) Thanks to the solution provider!!