Hafiz Peogeot , Remove the batteries and clean all the battery contacts of any dust corrosion. I have found using a ink eraser(slightly abrasive) on a pen works well(make sure to blow all dust and debri out). Now install brand new good quality batteries and try. If this does not do it, try the camera reset procedure from link below. Link #1 is cleaning battery contacts/corrosion and 2nd link is reset procedure for your camera.
https://www.youtube.com/watch?v=SHbimNl7XSo
http://ww2.justanswer.com/uploads/RUSSTING/2010-06-28_150625_Sony_Reset.pdf