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Well, I'm sure you took the lens cover off. If it was working previously then most likely it is one of the above and in any event not really a user repairable fault (unless you are well into this sort of thing). Just for info if you take things apart then there can be a capacitor that is charged, which can zap things if you touch them before discharging the capacitor.
Always pop back and let us know the outcome - thanks
message edited by Derek