try this:

1) in standby mode go to the sevice meny by pressing: *>*<<*<*

">" means you you have to press right
"<" means you have to press left
"*" is the star button left from the 0 button
(i don't think your a fool or something but a lot of people seems to have problems with it :p)

new in the menu that pops up select discharge flash. now your flash will go of one time to decharge it.

hope it helps :)