In the past I have found that you could clean the battery terminals, both at the bottom of the battery bay and on the battery lid with lighter fluid and a cotton swab and get the camera up and running, but the cleaning fluid needs to be lighter fluid as alcohol didn't do the trick for me ... AND the type of battery is pretty critical too, as regular alkaline batteries do not have sufficient current to do the job, I use the Energizer Ultimate Lithium battery and coat the ends with dielectric grease (just a dab/small amount) ... I have had some success using this described method ... thank you, good luck ... Jim Nickerson, Pentax user and repairer ... 8)