Hi and welcome to the forum:
Have you tried turning the camera on with any other lens and, if so, what was the result?
If that is the case, I would suggest that the camera likely does not have the issue, but there is some short in the circuitry of the lens causing the camera to lock up. Next step is to find another camera that is compatible and put the lens into that it to see if the lens locks it up.
We agree with the information that Tronhard has been able to provide. If the 24-70mm lens does not work on a different Canon camera body then you may submit a repair request through our online repair portal to see if you could send it to our facility for service.