take a look at the teardown guide for this camera..click on the camera icon up top right, step 17…top board is the likely culprit here for your symptoms. It's a bit of a saga to get to but it doesn't look too hard. Just be careful with the flash and make sure you've discharged it like the instructions show. it may be that you've got a loose connection from the drop. it may be a crack in the board :-( the only way to know is to open it up and look. Getting a replacement part might be feasible from an online dealer/ebay or from another broken camera.. good luck