No worries Carlita ... Last year here at Estoril Open I went through something similar
I was supposed to take a photo of a friend with Marat ... And I kept clicking ... But it wasn't working
Untill I finally understood what Marat was trying to tell me all along ... I had to open the objective
This is what happens when you join someone who rarely takes photos like me with a hightech camera!
but my camera was on and everything was ready to go....
once in Rotterdam I wanted to take a pic of Goran Ivanisevic, but my big lens was too close...so I had to zoom out and it took a little while
Goran told me I should buy one of those throw away cameras cause they always work, not such an expensive one