If the camera now won’t power on at all, the exact cause can’t be diagnosed remotely, but a few safe checks may help narrow it down:

• Remove the lens and try powering the body on by itself.
• Remove the battery for an extended period (for example overnight), then reinstall it and try again.
• Check whether the issue happens with and without the memory card inserted.
• Inspect the battery, battery contacts, lens mount, and lens contacts for anything loose, bent, dirty, or obviously damaged.

Modern cameras are fairly robust, but violent movement could potentially affect internal connections or the image stabilization system in the body or lens. The fact that it will not turn on at all suggests more than a simple shooting-setting problem.

If these basic checks don’t change anything, the practical next step is professional inspection/service. Avoid further forceful shaking or repeated power attempts if you suspect physical damage.