Try this little trick that I have discovered. Press START for 4 seconds, then you will hear 2 beeping sound. Then alternately press START and STOP 4 times. You will see a cursor like display on the right side of the LCD. Press MENU or FUNCTION then input 97. Look for "CARD TEST" then press OK then press STOP. Pls let me know if this trick worked.
Usually answered in minutes!