Are you sure your memory card is still functional? Are you sure there is one memory card inside?
This is what I suggest:
If you can't view any picture in the camera, try to rescue the pictures with when it is connected with a USB cable to a computer or with a card reader on your computer. Then make sure your battery is still ok.
Then when the memory card is out of the camera, clean the contacts, by rubbing them with a dry cloth. Place the card back in the camera and do a format of the memory card. Don't do a format, before you have all the pictures from the card on your computer or another save place. Make it a habit to save the pictures you take on a computer and on an external medium. Can be an external drive or a CD or DVD. One backup is most of the time not enough.