Why is my camera not working?

mu camera won’t turn on!! I thought it was just the battery needing to be charge, but the battery wasn’t holding any charge ( it would turn red and then a few minutes later turn green). I bought a new battery and still nothing yet. This new battery seems to hold charge though..

I bought the camera offline a few months ago. Haven’t had problems with it since, now nothings working :(

I don’t have any experience with cameras so any advice helps!!

Thanks