My daughter dropped her camera. You can see through the view finder and it will focus on whatever you are looking at. You take the picture and all you get is a black screen on the review of the picture. It even saves just a black picture to the memory card. I have tried a different memory card, different lens and different battery with all the same results. I have reset the camera back to factory settings. I also have enabled live view and get nothing. Thanks for any help.
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What is there to troubleshoot? You dropped it. It’s damaged. It needs repair/replacement.
Your symptoms would seem to indicate a problem with the shutter or mirror mechanisms. This isn’t something a laymen could fix.
The shock may have broken any number of parts. The processor or the sensor is my guess. It's needs to go to Canon for service.