Kodak DCS 500 Series User Manual page 244

Symptom
The camera is
"locked." Nothing
works.
B-4
Cause
The battery is not
securely in place.
The camera needs to be
reset.
Remedy
Remove then insert the
battery.
Remove the battery.
Open the Battery/PC
Card door and gently
insert a paper clip into
the Reset button.
Continue pressing the
paper clip until a slight
"click" is felt.