my micromax A57 is hanged and locked help me

My smart phone hanged, Micro max A 57 ninja 3.0 is not responding and and when i switch on my cell by removing my battery and putting it back again it shows the display with the lock pattern but when i try to unlock the pattern the sensor doesn't works at all and gets switched off again...please help me with this issue...I have all my contacts and data saved in my cell and i am not receiving any calls or msgs