Hi\r\n I have a fujifilm f470 finepix camera. One

Hi,
Is it just the live view from the lens that you can't see ( totally blank screen), or are the icons visible?
If it still shows the icons but no live view then I suspect the shutter mechanism is stuck over the lens inside the camera.
Have a look at the lens and see if you can see the inner lens? You may have to adjust the zoom to bring the inner lens up to the end of the lens barrel.
If it is stuck then it will require removing and inspecting / cleaning.