My camera makes a tikking buzzing sound and the sreen is black

It was always working fine, but didn’t use it for about 6 months.

It only acts normal when i just jut the right button on the lcd screen. Then it closes the lens, makes no noise, and i can just review my recordings. But once i turn it in shooting mode it starts ticking and buzzing and the lens seems to be flickering. What should I do?