i,m hoping someone can help, i,v had my 15800 for quite a few months and love it !! untill now all of a sudden when i try to take some pictures the message camera failed appeares, no settings or anything has changed and my memory card has loads of space left, i hope some one can help me please, many thanks paul a, i,v also noticed that my camera is using 91% of the battery even tho its not on !!! i,v tried all above solutions but to no avail, hoping someone can help, many thanks paul a