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My camera wont turn on and the green light at the back flashes when I hold the on button. never had this issue before please advise what to do Tony

I don’t know the exact answer but you could try checking the batteries. Another is take out the batteries and then press"On" button for 15 seconds or more. Put in know good batteries and see if works. This is generally the first step for troubleshooting anything electronic. Update (02/13/2018) Does the lense retract when you remove the batteries?