SHARP ZQ700 ELECTRONIC ORGANISER - DATA LOST?

SHARP ZQ700 ELECTRONIC ORGANIZER?
I HAVE HUNDREDS OF PHONE NUMBERS IN MY DATABANK. I HAVE REPLACED ALL MY BATTERIES. I CAN NOT HOWEVER OBTAIN ANY INFO. I KNOW IT IS STILL THERE. THE 'ON' BUTTON SEEMS TO BE WORN OUT, AND ALSO THE CONTRAST SEEMS NOT TO BE WORKING. ANY ADVICE PLEASE?
THERE IS A COMPUTER LINK SLOT. I REQUIRE SUCH A COMPUTER LINK CABLE TO TRANSFER IT TO A COMPUTER. I DON'T HAVE SUCH A CABLE UNFORTUNETLY. DOES ANYONE HAVE SUCH A CABLE, OR CAN ADVISE ME WHERE TO GET FROM?